-Bone marrow biopsy shows sheets of plasma cells, positive for CD138 and CyclinD1 (20% of plasma cells); negative for CD79a (aberrant loss), CD3. Stain for CD56 is not diagnostic (with negative stain for positive control)

-With diffuse infiltrate of plasma cells in bone marrow, the final diagnosis if plasma cell myeloma (instead of plasmacytoma)

-It is unknown why serum kappa/lambda is normal (unless it is a case of non-secretory myeloma)

-Optional IHCs for further testing: kappa, lambda, CD117, CD56 (repeated)

Diagnosis: plasma cell myeloma

++++++

CASE 2:

50 y/o female with abdominal pain, weight loss, diagnosed with Thalassemia at outside hospital and treated at local hospital.

Imaging showed enlarged neck lymph node, axillary lymph node, splenomegaly.

CBC: WBC 21.9 K/uL, Neu 5.2 K/uL, Lym 16.5 K/uL, Mono 0.2 K/uL, no blast. Hb 8.8g/dL, Platelet: 276k/uL

BM Bx, BM Asp:

https://pathpresenter.net/public/presentation/display?token=f593c4fe

Findings:

-Biopsy: hypercellular (60%), adequate megakaryocytes, increased orthochromic normoblasts

-Aspirate: numerous erythroids

Diagnosis: Thalassemia (BM)

Note that lymphoma in LN (neck, axilla) cannot be ruled out

++++++

CASE 3:

20 y/o female, with neck lymph node biopsy and bone marrow

CBC: WBC 191 K/uL, Neu 2.2 K/uL, Lym 181 K/uL, Mono 6.9 K/uL, blast 5%. Hgb 3g/dL, Platelets 47K/uL

Neck lymph node, BM Bx:

https://pathpresenter.net/public/presentation/display?token=1f823a0e

Findings:

LN bx, BM bx: diffuse/numerous large blasts, many mitosis & tingible-body macrophages

(+) CD117 in BM bx (neg in LN bx?), Ki67 (90%)

(-) TdT, CD34 (ctl suboptimal), CD1a (ctl suboptimal), CD79a, CD4, CD3, CD20

Diagnosis: AML with myeloid sarcoma in LN

Note: neg CD117 in LN bx may be artifact, note that part of BM bx is also false-negative, may perform CD43 on LN bx to confirm AML/myeloid sarcoma

+++++

CONFERENCE 6 (April 2023)

CASE 1:

56 y/o male, with lower-jaw mass; blood test showed elevated lambda

Lower-jaw biopsy:

https://pathpresenter.net/public/presentation/display?token=cf6bcc16

Bone marrow:

https://pathpresenter.net/public/presentation/display?token=e0d476ea

https://pathpresenter.net/public/presentation/display?token=f6daed86

Findings:

-Lower-jaw mass shows diffuse infiltration with plasma cells having large nuclei, prominent nucleoli (note that there is a floater with carcinoma in upper left section)

(+) CD138, MUM1, Ki67 (low at 10-20%?)

(-) CD3, CD20, CD45, Pan-keratin

Diagnosis: Plasmablastic lymphoma

-BM: normal distribution of all cell lineages (normal stains for CD3, CD20, CD79a, CD138, CD56,cyclinD1)

++++

CONFERENCE 7 (June 2023)

CASE 1:

35 y/o male, diagnosed at outside hospital in 2021 with oropharyngeal NK/T cell lymphoma, nasal type

BM on admission: (23HT1872)

https://pathpresenter.net/public/presentation/display?token=3d317206

BM Bx unremarkable, no infiltrates (Aspirate 1: unremarkable, Aspirate 2: out of focus)

(+) CD45, CD3 (scattered)

(-) CD56, CD2, CD20

Diagnosis: negative for NK/T lymphoma in BM

Follow-up:

Patient s Hgb kept dropping in 2 recent months; also tested positive for EBV, and sinus infection

Another BM was performed:

https://pathpresenter.net/public/presentation/display?token=5eb66dae

Findings:

-EBV positive

-BM BX cellularity is still low (20-30%) in a 35 y/o male

-BX and Asp show no obvious lymphocytic infiltrates

Diagnosis: BX/asp did not change from 1^st to 2^nd BM. Pancytopenia (with hypocellular BM) is likely secondary to other etiologies besides lymphoma

Suggestion: CD56 for BX to definitely exclude NK/T cell lymphoma

++++++++

CASE 2:

52 y/o male, with parotid gland mass for 4 months. Parotid gland biopsy was diagnosed at outside hospital as plasmacytoid B-cell lymphoma, vs. plasmacytoma. Patient was admitted. Imaging showed multiple lesions in neck (bilateral), lung, nose, abdominal lymph node, bones

BM Bx, Immunology blood test: (23GT8344)

https://pathpresenter.net/public/presentation/display?token=41e65c5a

Findings:

-SPE with gamma spike, IgG-Lambda monoclonal gammopathy, elevated Beta2-Microglobulin

-BM Bx: many lymphs, many erythroids, a few plasma cells

-Aspirate: many lymphocytes including some plasmacytoid lymphs, a few plasma cells

Differential DX: lymphoplasmacytic lymphoma vs marginal zone lymphoma

Suggestion: CD79a, CD138. MYD88 may be useful if available

Follow up:

More IHCs done:

https://pathpresenter.net/public/presentation/display?token=a6771211

Findings:

-CD20 neg may be due to Rituximab

-CD79a neg (?)

-CD138 scattered pos

Differential DX: lymphoplasmacytic lymphoma vs marginal zone lymphoma, unknown reason for neg CD79a

+++++

CASE 3:

65 y/o male, with hard palate tumor

Bx, IHC of hard palate tumor: (23HT1570)

https://pathpresenter.net/public/presentation/display?token=33eb836a

Findings:

Morphology: glandular formation, favors carcinoma

(+) CD138

(-) CD45, CD20

Diff DX: carcinoma vs plasma cell neoplasm

Suggested: Pan-K, kappa, lambda, CD56, CD117

Consultation with ENT Pathologist at UT (Dr Saluja):

-Based on the IHC this tumor is more compatible with polymorphous adenocarcinoma initially known as polymorphous low grade adenocarcinoma (PLGA). The other differential is myoepithelial carcinoma as these tumor can have some immunostains overlap with polymorphous adenocarcinoma based on different lab protocols.

-These tumor may be managed as low to intermediate grade salivary tumors.

++++++

CONFERENCE 8 (July 2023)

CASE 4:

60 y/o male, with neck mass slowly growing over a year. Patient had acute hematologic malignancy 22 years ago per verbal information. Patient now has 5cm neck mass, pancytopenia. Imaging showed lesions in nasopharynx, parotid glands, neck lymph nodes, abdominal lymph nodes, splenomegaly

BM Bx & Asp, core Bx of neck LN, Bx of Nasopharynx:

ruhttps://pathpresenter.net/public/presentation/display?token=c49cafbb

Findings:

-Morphology: diffuse distribution in aspirate, BM Bx (lower part with better resolution), nasopharynx Bx of small-intermediate lymphocytes; no mitosis. Malignant cells are mixed with orthochromic normoblasts in BM Bx

-Pos EBV by PCR

-CBC: pancytopenia

-IHCs: N/A

-Diff DX:

(a) lymphoma/leukemia (B, T, NK)-> suggest IHCs for CD3, CD79a, CD56, TdT, Ki67; also EBER

(b) unknown previous Hx of acute heme tumor 22 years ago?

Follow-up:

More IHCs on LN (updated):

https://pathpresenter.net/public/presentation/display?token=f301ac97

Findings:

Mostly small lymphocytes, monocytoid lymphocytes

Pos for CD20, CD79a more than for CD3, CD5

Pos (subset) bcl6

Neg CD10, CD23, cyclinD1, CD56, TdT

Ki67 20%

->ruled out: SLL, FL, MCL

Diagnosis: Marginal Zone Lymphoma

More IHCs on BM (updated):

https://pathpresenter.net/public/presentation/display?token=349004cc

All neg (?)

Ki67 50% (proliferative BM)

++++++

CASE 5:

32 y/o female; in Jan 2023 had skin lesions throughout body, also bone lesions. Patient had biopsy of abdominal skin lesion, diagnosed as generalized eruptive histocytosis at outside hospital with the following IHC findings: LCA neg, CD3 neg, CD20 neg, CD1a neg, CD117 neg, S100 neg, CD68 pos, Ki67 30%. Patient underwent chemotherapy (6 cycles of CHOP), now presents with lesions in arms

Bx, IHCs of arms:

https://pathpresenter.net/public/presentation/display?token=76292248

Findings:

Sheets of spindled cells with a whorled pattern

(+) CD56, S100, CD4, CD68

(-) CD1a, CD117, CD8, PanCK, TdT, CD20, CD34, SOX10, CD30, ALK, CD21, CD45, CD3

Diagnosis: Interdigitating dendritic cell sarcoma

Other Diff DX that were excluded:

(a) Blastic plasmacytoid dendritic cell neoplasm (CD4, CD56)-> not c/w morphology

(b) Histiocytic sarcoma-> not c/w morphology

+++++

CONFERENCE 9 (July 2023)

CASE 1:

60 y/o male, with swelling inguinal lymph node, further examination showed widespread lymphadenopathy

LN Bx, IHC of right superficial inguinal LN:

https://pathpresenter.net/public/presentation/display?token=b0af61e9

Findings:

Numerous nodules, containing mostly small lymphocytes w scattered large cells, scattered mitosis

Diff DX at low-power microscopy: NLPHL, TCR LBCL, FL

IHCs: CD3, CD5 >>CD20

(+) in residual follicle: PAX5, CD10, bcl2, CD23

(-) bcl6, CD15, cMYC (blurred), cyclinD1, MUM1, TdT

CD30 (equivocal)

(+) Ki67 (60%, among large cells)

Diagnosis: T cell rich B cell lymphoma (TCR BCL)

++++

CONFERENCE 10 (August 2023)

CASE 2:

53 y/o female, a year prior was diagnosed nasal tumor, underwent radiation therapy. The nasal mass currently remains at the same size.

Nasal mass:

https://pathpresenter.net/public/presentation/display?token=a5baa309

Findings:

Nasal mass having subset of large cells with prominent nucleoli, a few mitosis

(+) CD138, CD79a, MUM1,

(-) EMA

Diagnosis: Plasmablastic lymphoma

Suggestion: need to check EBV, and HIV status

+++++

CASE 3:

70 y/o male, 5 years ago diagnosed with DLBCL, underwent 6 cycles of chemotherapy, with complete remission. Now patient presents with 27 mm chest wall lesion, abdominal lymphadenopathy, bilateral inguinal lymphadenopathy, increased HBV viral load.

L Chest wall lesion, IHC:

https://pathpresenter.net/public/presentation/display?token=77332c91

Findings:

-Follicles of lymphocytes (more small lymphocytes)

(+) CD20,CD79a, PAX5, CD10, bcl6

(-) CD3,CD5,CD23 (CD23 seen in residual dendritic cells),CD15, CD30, bcl2 (?, blurred)

Ki67 low, spread-out (<20%)

Diagnosis: Follicular B cell lymphoma (grade 1)

Suggestion: repeat bcl2 for quality assurance

++++

CASE 4:

65 y/o female, with past history of leukemia (2012), non-Hodgkin lymphoma (2020), s/p therapy. Now (Aug 2023) patient presented with enlarged neck lymph node (bilateral, 5-6 cm), axillary/abdominal/inguinal lymphadenopathy, enlarged tonsils, and mild splenomegaly. Lab results showed anemia and thrombocytopenia, decreased albumin, elevated LDH,

Neck lymph node biopsy:

https://pathpresenter.net/public/presentation/display?token=35575e9b

Findings:

Neck mass shows vague nodules containing lymphocytes of intermediate size, many tingible-body macrophages, moderate mitosis

Diff DX: T or B lymphoblastic lymphoma, follicular B cell lymphoma, Burkit lymphoma, AITCL (low in list)

(+) CD3, CD5, CD4, CD8, ki67 (80%)

(-) CD20, CD79a, MUM1 (pos in residual follicles), PAX5, CD10, bcl6. CD15, CD30, ALK1, bcl2, TdT (?), CD138 (pos in plasma cells),
cMYC, cyclinD1

Diagnosis: T lymphoblastic lymphoma (BM likely involved with low platelet count)

Suggestion: CD1a to r/o PTCL, NOS

+++++

CASE 5:

53 y/o female, with lymphadenopathy (bilateral neck, bilateral axillary, R inguinal). Lab results show elevated LDH, normal CBC.

L neck lymph node biopsy (4 cm):

https://pathpresenter.net/public/presentation/display?token=7b89b57f

Findings:

Neck mass shows large cells with large nucleoli (no multinucleated cells) in background of small lymphocytes in vague nodules, rare mitosis

Diff DX:TCR Large BCL, NLPHL, HL (low in diff DX)

(+) CD20, Ki67, CD45

(-) CD15, PAX5 (large cells not dim), CD10, bcl6, ALK1, CD21, CD23

CD3 forms rosettes around large B cells

Background (small cells, more B cells than T cells): pos for CD3, CD5, (neg CD2?), CD7, CD4, CD8, CD20, PAX5, residual dendritic cell (CD21, CD23).

CD30 not useful (?, too dark or too light, need to titrate CD30)

Diagnosis: Nodular Lymphocyte Predominant Hodgkin Lymphoma (NLPHL)

++++++++++++++++++++++

CONFERENCE 11 (August 2023)

CASE 1:

71 y/o male, with CML, undergoing treatment, widespread lymphadenopathy (neck, axillary, abdominal, inguinal), elevated beta2 gammaglobulin, leukocytosis, normal LDH

BM Bx and Asp:

https://pathpresenter.net/public/presentation/display?token=2a73283f

Findings:

CBC (no PBS available): leukocytosis (elevated lymphs by manual differential), anemia, normal platelet count

BM Asp (slide 6 is better than 1): predominant immature cells

BM Bx: 40%, focal areas with high cellularity and monomorphic

Diagnosis: blast crisis (myeloid vs lymphoid) with Hx of CML, difficult to differentiate

Suggest IHCs on BX:

-To r/o AML: MPO, CD117

-To r/o ALL: TdT, CD79a, CD3, CD4, CD8

+++++++++++++++

CASE 2:

27 y/o male, diagnosed with CML, positive BCR::ABL1 seven years ago (2016), treated with Imatinib 100mg x 4 tabs/day, stopped taking med in Jan 2023. Now (Aug 2023) WBC is elevated; unknown treatment

BM Bx and Asp:

https://pathpresenter.net/public/presentation/display?token=83b004a9

Findings:

BM Bx: hypercellular (~100%), heterogenous myeloid cells, high M/E ratio, many dwarf megs

BM Asp: findings similar to those in BX

CBC: normal Hgb, Plt, elevated WBCs with predominant neutrophils (WBC progressively decreased, likely with TX)

Diagnosis: CML in chronic phase

+++++

CONFERENCE 12 (October 2023)

CASE 1:

1 y/o female, neck lymphadenopathy (2.5 cm), splenomegaly (11 cm), elevated LDH (1531 U/L), WBC 1,3 x10⁹/L

Spleen biopsy:

https://pathpresenter.net/public/presentation/display?token=04b65589

Findings:

Pleomorphic cells, no predominant multinucleated cells

(+) CD30, ALK, CD3 (likely cytoplasmic), Ki67

(-) CD20

Diagnosis: ALCL, ALK pos (Not many horse-shoe cells->monomorphic variant)

Notes: the following lymphomas were ruled out:

cHL: r/o with no HRS cells, CD3 pos

DLBCL: r/o with CD20 neg

PTCL-CD30 pos: r/o with ALK pos

ALK pos-LBCL: r/o with CD30 pos

+++++++++++++++++++++++++++++++

CASE 2:

73 y/o male, with thrombocytopenia, leukocytosis

BM Bx and Asp:

https://pathpresenter.net/public/presentation/display?token=db2818ba

Findings:

BM Asp/Bx are hypercellular, monotonous population (intermediate-large nuclear size)

(+) CD43, MPO

(-) CD3, CD20, PAX5

Diagnosis: acute myeloid leukemia (AML)

Suggestion: testing for t(8;21), t(15;17), FLT3, NPM1, CEBPA

++++++++++++++++++++++++++++++

CASE 3:

55 y/o male, with history of gastric cancer, spinal metastasis, currently with leukocytosis

BM Bx and Asp:

https://pathpresenter.net/public/presentation/display?token=d3238d80

Findings:

BM Asp/Bx: trilineage hematopoiesis, including a subset with large nuclear size (histiocytes), BX hypercellular (70%) with hemophagocytosis,

BM cells appear normal (no associated lymphoma/leukemia, no pathologic lesion)

Diagnosis: cannot r/o HLH

Suggestion: Check CBC, ferritin, Triglycedride, Fibrinogen, (sCD25), EBV (serology or EBER), IHC for CD68

In order to get a more definitive diagnosis of HLH, at least 5 of the following 8 criteria need to be met:

1. Fever (peak temperature of > 38.5 C for > 7 days)

2. Splenomegaly (spleen palpable > 3 cm below costal margin)

3. Cytopenia involving > 2 cell lines (hemoglobin < 9 g/dL [90 g/L], absolute neutrophil count < 100/mcL [0.10 10⁹/L], platelets < 100,000/mcL [100 10⁹/L])

4. Hypertriglyceridemia (fasting triglycerides > 177 mg/dL [2.0 mmol/L] or hypofibrinogenemia (fibrinogen < 150 mg/dL [1.5 g/L]

5. Hemophagocytosis (in samples of bone marrow, spleen, or lymph nodes) already seen here in this case

6. Low or absent natural killer cell activity

7. Serum ferritin > 500 ng/mL (> 1123.5 pmol/Lng/mL)

8. Elevated soluble interleukin-2 (CD25) levels (>2400 U/mL or very high for age)

++++++++++++++++++++++++++++++++++++++

CONFERENCE 13 (December 2023)

CASE 1:

68 y/o male, enlarged axillary lymph node

Axillary lymph node:

https://pathpresenter.net/public/presentation/display?token=277c16dc

Findings:

Back-to-back follicles with >50% large centroblasts

(+) bcl6, CD20, Ki67 (60-70%, evenly-distributed), CD30, cMYC (scatterd), MUM1 (scattered)

(-) CD10, ALK, CD15, bcl2, CD5, cyclinD1, CD3, CD23,

CD21 pos for follicular dendritic cells

Diagnosis: FL, high-grade (3/3)

+++++++++++++++++++++++++++++++++++++++++++++++++++

CASE 2:

49 y/o male, bilateral neck lymphadenopathy

Neck lymph node:

https://pathpresenter.net/public/presentation/display?token=4b5d32ec

Findings:

Back-to-back follicles with >50% large centrocytes

(+) bcl6 (?->repeat), CD20, Ki67 (60%, evenly-distributed),

(-) CD10, bcl2, CD5, cyclinD1, CD3, cMYC, MUM1,

CD21 pos for follicular dendritic cells

Diagnosis: FL, high-grade (3/3)

++++++++++++++++++++++++++++++++++++++++++++++++++++++++

CASE 3:

50 y/o male, with tumor on nasal skin for 5 months, also a skin lesion 7x6 mm

Skin biopsy:

https://pathpresenter.net/public/presentation/display?token=67ef2ed5

Findings:

Diffuse dermal infiltrate with large-pleomorphic cells, many with spindle-ovoid shape

(+) CD4, S100, CD68, Ki67 (20%), vimentin

(-) CD34, CD21, CD1a, CK5/6, HMB45, CD56, Melan A, p63, CD45

Diff DX:

-Langerhan cell sarcoma (LC): r/o with neg CD1a

-Follicular dendritic cell sarcoma (FDC): r/o with neg CD21, pos CD68

-Blastic plamacytoid dendritic cell tumor (PDC): less likely with pos S100; neg CD56

-Histiocytic sarcoma (H): r/o with neg CD45, pos S100

-Interdigitating dendritic cell sarcoma (IDC): favored with pos S100, vimentin, neg CD1a, neg CD45, neg CD21, neg Cytokeratin, neg CD34, Ki67 at 20%; also Dx of exclusion

Diagnosis: Interdigitating dendritic cell sarcoma

+++++++++++++++++++++++++++++++++++++++++++++++++++++++

CASE 4:

30 y/o male, bilateral neck lymphadenopathy. A previous lymph node biopsy showed tumor cells positive for CD45, Vimentin (+/-), Ki67 (40%); negative for panCK, CD3, CD20, CD79a, CD138

Repeated neck lymph node biopsy:

https://pathpresenter.net/public/presentation/display?token=390548d0

Findings:

Largest fragment: diffuse infiltrate with large pleomorphic cells, with mitosis (smaller fragment with small T cells)

(+) bcl2,CD43, MPO, Ki67 approach 60%

(-) CD3, CD20, CD2, CD10, CD5, CD7, bcl6, MUM1, TdT, CD117, cMYC, cyclinD1

Ruled out carcinoma, T/B lymphoma, plasma cell neoplasm

Diagnosis: myeloid sarcoma;

Suggestion: need to perform BM to r/o AML

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

CONFERENCE 14 (January 2024)

CASE 1:

39 y/o female, diagnosed with HLH at outside hospital, now admitted and had another BM

BM Bx, Asp:

https://pathpresenter.net/public/presentation/display?token=d9291847

Findings:

BM aspirate shows a moderate number of histiocytes with phagocytosis.

Biopsy also shows suggested evidence of phagocytosis

Diagnosis: likely HLH

Notes:

In order to get a more definitive diagnosis of HLH, at least 5 of the following criteria need to be met:

9. Fever (peak temperature of > 38.5 C for > 7 days)

10. Splenomegaly (spleen palpable > 3 cm below costal margin)

11. Cytopenia involving > 2 cell lines (hemoglobin < 9 g/dL [90 g/L], absolute neutrophil count < 100/mcL [0.10 10⁹/L], platelets < 100,000/mcL [100 10⁹/L])

12. Hypertriglyceridemia (fasting triglycerides > 177 mg/dL [2.0 mmol/L] or hypofibrinogenemia (fibrinogen < 150 mg/dL [1.5 g/L]

13. Hemophagocytosis (in samples of bone marrow, spleen, or lymph nodes) already seen here in this case

14. Low or absent natural killer cell activity

15. Serum ferritin > 500 ng/mL (> 1123.5 pmol/Lng/mL)

16. Elevated soluble interleukin-2 (CD25) levels (>2400 U/mL or very high for age)

-Criterion 7 is the most important one, the ferritin level in HLH is usually much higher than the minimum threshold cited here (500). I real cases of HLH, ferritin is typically in the thousand s range

-Criteria 6 and 8 are difficult to meet due to lack of available tests

-Since HLH is often associated with EBV infection, auto immune disease, and lymphoma (esp. T cell lymphoma). It is recommended that workup for these conditions is pursued

+++++++++++++++++++

CASE 2:

42 y/o female, diagnosed with classical Hodgkin lymphoma at outside hospital, presented with pancytopenia in 2 weeks with unknown etiology

BM Bx:

https://pathpresenter.net/public/presentation/display?token=68a8373c

Findings:

Diffuse infiltrate of large lymphoma cells; only rare multinucleated cells

(+) CD45,CD3

(-) CD30, PAX5,CD20,CD15

Classical Hodgkin Lymphoma is unlikely with given morphology and IHCs

Diagnosis: Peripheral T cell lymphoma, NOS (not anaplastic large T cell lymphoma)

Suggestion: IHCs for CD4, CD8, CD7, CD5

Pancytopenia likely due to BM infiltrate by lymphoma cells

++++

CONFERENCE 15 (January 2024)

CASE 1:

24 y/o male, enlarged clavicular lymph node (bilateral)

L clavicular lymph node (15 mm):

https://pathpresenter.net/public/presentation/display?token=0812fe2e

Findings:

Large cells (HRS, mummified cells?) with many small lymphocytes in background

(+)CD30 (blurry?), Ki67

(-)CD4, CD20,PanCK, CD3, CD2, CD43,ALK

[PAX5: suboptimal (neg for CD20-pos cells)]

Diagnosis: Likely cHL,

Note: difficult to subtype with core BX

Suggestion: repeat CD30, PAX5; also perform CD45, CD15

Follow-up:

IHCs for CD30, PAX-5, CD15, CD45

https://pathpresenter.net/public/presentation/display?token=0812fe2e

CD15: difficult to interp (strong nuclear stain), neg CD45

Diagnosis: cHL

+++++++++

CASE 2:

61 y/o female

L neck lymph node biopsy (2 cm):

https://pathpresenter.net/public/presentation/display?token=bf9376f6

Findings:

Many large pleomorphic cells, no RS cells, no horse-shoe cells; increased mitosis

(+) CD30,KI67

(-) CD45,CD3,CD2,CD15, CD20, PAX5

Diagnosis: possible ALCL, monomorphic variant

Suggestion: to perform ALK1, CD4, CD8

Follow-up:

(+) CD4

(-) CD8, ALK

Diagnosis: ALCL, ALK-neg, monomorphic variant

(usually ALK-neg in adult, CD4-pos, CD30-strongly pos, CD45-neg, CD3 neg)

++++++++

CASE 3:

58 y/o male

R axillary lymph node biopsy (3 cm):

https://pathpresenter.net/public/presentation/display?token=2947747e

Findings:

Large pleomorphic lymphocytes

(+) CD5,CD20, PAX5, Ki67 (60%)

(-) CD3 (?), bcl2 (suboptimal),CD10, bcl6, ALK, CD30, PanCK, cyclinD1

CD4 and CD8 show polyclonal distribution

Diagnosis: CD5-pos DLBCL

+++++++

CASE 4:

55 y/o male, spleen tumor

Spleen biopsy:

https://pathpresenter.net/public/presentation/display?token=9334ce45

Findings:

Diffuse lymphoid infiltrate, HRS-like cells, background of small lymphocytes, collagen bands

(+) CD20, PAX5, CD45, Ki67 (low at 10%)

(-) CD15, CD3, CD30, ALK, EMA, CD138, AFB, PAS, silver, CD1a, CD23, CD21, S100

CD4, CD8: mixed, polyclonal

CD68: histiocytes in spleen

Many CD3 pos cells (T lymphocytes)

Differential DX s that were excluded:

(a) cHL: not c/w IHC pattern

(b) T cell lymphoma including ALCL

(d) Follicular dendritic sarcoma: neg CD21, CD23

(e) Indeterminate dendritic cell tumour: neg CD1a, S100

(f) Reactive histiocytosis, with background of inflammatory T cells and B cells: not c/w presentation,

neg AFB, PAS (AFB, fungal also less likely without granuloma, necrosis)

Diagnosis: splenic marginal zone lymphoma (SMZL), typically having no peripheral lymphadenopathy

(MZ lymphoma cells with clear cytoplasm, scattered large cells are part of this lymphoma)

++++++++++++++++++++++++++

CONFERENCE 16 (February 2024)

CASE 1: 24HT462

46 y/o female, enlarged clavicular lymph node in the last 6 months. Patients had biopsies done 4 times in 6 months without definitive diagnosis. Ultrasound showed R clavicular lymph node (3 cm), also many enlarged neck lymph nodes and pelvic lymph nodes, suspicious for lymphoma.

Clavicular lymph nodes (procedures done in 3^rd and 4^th times)

https://pathpresenter.net/public/presentation/display?token=39fc2047

Findings:

Thickened capsule, increased vessels. diffuse distribution of small-intermediate lymphocytes

(+) CD45, mixture of B cells (PAX5, CD20), and T cells (CD3) with T >> B

(-) CD15, CD30, EMA

Diff DX: Angioimmunoblastic T cell lymphoma (AITCL) vs reactive lymphoid tissue

Suggestion: bcl6, CD10, Ki67, EBER, CD21

Follow-up:

Additional stains:

(+) bcl6 (subset), Ki67 (high), CD4 (appears predominant even though CD8 is not done)

(-) CD10, CD21

Diagnosis: Angioimmunoblastic T cell lymphoma (AITCL)

+++++++++++++++++

CASE 2: 24HT461

27 y/o male, clinical information is included in link below

Rectal biopsy with ulceration, and BM:

https://pathpresenter.net/public/presentation/display?token=677ad884

Findings:

BM Bx: normal trilineage maturation

Normal distribution of CD3, CD79a, CD38, CD138

K/L: polyclonal

Rectal Bx: large cluster of plasma cells

(+) CD79a, CD38, CD138

(-) CD3

K/L: polyclonal

Diagnosis:

BM Bx: normal

Rectal Bx: focal cluster of reactive polyclonal plasma cells

+++++++++++++++++++

CASE 3: 24GT2515 v 23HT4957

60 y/o male, a year ago was diagnosed with primary cutaneous ALCL (stage IV, with lesions in axillary /inguinal lymph nodes, skin lesions throughout body), s/p CHOEP 5 cycles, now with leukocytosis, monocyte > 3,000.

A BM is performed

Skin lesion (a year ago, in 2023):

https://pathpresenter.net/public/presentation/display?token=819e957f

Findings:

Diffuse pleomorphic lymphoma cells, increased mitosis

(+) CD3, CD4, CD30

(-) CD2? (suboptimal control), CD5, CD7, CD8, ALK, cyclinD1, bcl2, MUM1

Diagnosis: refractory CD30-pos lymphoproliferative disorder (including CD30-pos T cell lymphoma, and primary cutaneous ALCL)

BM Bx, Asp with CBC (2024):

https://pathpresenter.net/public/presentation/display?token=18409d9a

Diagnosis: normocellular with normal trilineage maturation

+++++++++++++++++++++

CASE 4: 24HT187

21 y/o female, with multiple bone lesions

BM Bx, Asp at multiple locations with MRI, CT:

https://pathpresenter.net/public/presentation/display?token=fe4437d6

Findings:

Diffuse, pleomorphic cells

(+) CD138, Vimentin, Ki67 (20%)

(-) CD10 (pos in basement membrane), SATB2, S100, CD99,CD45, CD1a, CD3, CD56, CD38, MUM1, K, L,

BCL2, SALL, OCT4, CK, CK7, EMA, Desmin, Myogenin, MyoD1, WT1, CD34,

CD31, ERG, Synaptophysin, Chromogranin A, CD68, CD79a, SOX-10, MelanA, HMB45,

CD68 (pos in a few pos histiocytes, with lots of background staining)

Diagnosis: Undifferentiated carcinoma/sarcoma (not lymphoma or plasma cell neoplasm)

Note: surgery as the main treatment modality

++++++++++++++++++++++++

CONFERENCE 16B (February/March 2024)

CASE 5:

26 y/o female, enlarged neck lymph node in the last 2 months, found to have widespread lymphadenopathy, lesion in spleen

R neck lymph node (2 cm):

https://pathpresenter.net/public/presentation/display?token=dd9f9b96

Findings:

Follicular infiltrates (back-to-back), intermediate & immature lymphocytes, containing tangible-body macrophages, and mitosis

(+) CD20, bcl6, CD10, Ki67 (no polarization),

(-) bcl2

T cells (CD3) are polytypic, mixture of CD4, CD8 pos cells, outside follicles

CD21, CD23 are pos for dendritic cells in follicles

PD1 is pos for TFH cells in follicles

Diagnosis: Follicular Lymphoma, predominantly Gr 3/3 (high grade) with neg bcl2

++++++

CASE 6:

76 y/o female, imaging of R axillary lymph node suggests malignancy, that of neck/abdominal/inguinal lymph nodes suggests inflammation,

Normal size of liver/spleen, normal LDH

R axillary lymph node:

https://pathpresenter.net/public/presentation/display?token=cce631fe

Findings:

Scattered follicles, some with increased centroblasts (labeled, reactive); mantle zone not well delineated (likely due to core bx)

(+),CD45, CD20, Ki67 (high in reactive follicles)

(-) panCK, CD3, bcl2, CD163

CD138 pos for plasma cells, increased in focal areas

Also a few small primary follicles (pos for CD20 and bcl2)

Diagnosis: most likely reactive follicular hyperplasia and a few small primary follicles, contained within core bx

Suggestion: cannot completely r/o a low-grade B cell lymphoma with plasmacytic differentiation (MZL); need to perform excisional BX for better LN architecture

Note that imaging with PET/CT may yield false-pos results

+++++

CONFERENCE 17 (April 2024)

CASE 4: 24HT1925

Adult female patient, 1 month history of jaw tumor. CT scan shows wide-spread lesion in R jaw, suggestive of malignancy

Jaw biopsy:

https://dpa-dapa.com/public/presentation/display?token=932154a2

Findings:

Diffuse immature lymphoid cells, some with plasmacytoid features, scattered mitosis

(+) CD38, CD79a, L>>K, CD138 (focal, less than expected)

(-) bcl2,CD23, CD3, cyclinD1, CD20

Diagnosis: likely plasmablastic lymphoma

Suggestion: Ki67, MUM1; also EBER

+++++++++++++++++++++++++++++

CASE 5: 24GT7409

37 y/o female, normal CBC, clinically suspected of myeloid leukemia

BM Bx, Asp:

https://pathpresenter.net/public/presentation/display?token=6096b504

Findings:

Bx: normocellular 60%, trilineage maturation

Asp (Giemsa) : trilineage maturation

Diagnosis: aspirate, Bx, CBC normal: unlikely to be associated with leukemia.

Suggestion: to completely r/o myeloid leukemia, suggest IHC on bx: MPO, CD34, E Cadherin, CD3, CD20 (to see if overall distribution is normal)

+++

CASE 6: 24HT2555

58 y/o male, admitted with L lower jaw tumor (2 month duration, 32x39 mm, imaging is suggestive of salivary gland tumor, favor pleomorphic adenoma, but cannot r/o lymphoma).

WBC 13,4k ; Neutrophil 9,2k; LDH: 332, beta2 microglobulin: 2747. Patient was discharged but was readmitted 2 weeks later due to mediastinal syndrome

L lower jaw biopsy:

https://pathpresenter.net/public/presentation/display?token=c9e48782

Findings:

-Core Bx shows vague small follicles (reactive, with no clear mantle zone).

-Interfollicular: Distribution of small lymphocytes with scattered large cells, no obvious HRS cells, no increase in mitosis; No evidence of adenoma.

-Reactive follicles

(+) CD20 [can not zoom down],CD21, CD23; Ki67 (polarized), bcl6 (weak), CD10 (weak)

(-) bcl2, CyclinD1, Myc

The interfollicular small lymphocytes:

(+) CD3, CD5, bcl2

(-) CD20, CyclinD1, Myc

Diagnosis: reactive lymphoid tissue;

Note: cannot find correlation with mediastinal syndrome

+++++

CONFERENCE 18 (April 2024)

CASE 1: DM24.213

40 y/o male, with large tumor in anterior mediastinum

Anterior mediastinum mass biopsy:

https://pathpresenter.net/public/presentation/display?token=22e620be

Findings:

Diffuse distribution of immature large cells, admixed with mitosis and eosinophils. Also increase in vascular structure.

(+) CD3, CD5 (subset), CD7, TdT (subset), Ki67 (60%)

(-) Pan-CK, CD19, CD79a, CD20, CD2 (aberrant loss), CD30, CD15, MPO

Diagnosis: T lymphoblastic lymphoma

Suggestion: optional IHCs for CD1a, CD4, CD8

++++++

CASE 2:

67 y/o female, previously diagnosed with follicular lymphoma Gr 3, now with enlarged L inguinal lymph node

L inguinal lymph node biopsy:

https://pathpresenter.net/public/presentation/display?token=dbd8bc97

Findings:

Follicles, back-to-back, mostly centrocytes in follicles

(+) CD20, CD10, bcl6

(-) CD3, CD5, bcl2, cyclinD1, Ki67 (low ~10%, no polarized pattern)

CD21, CD23: follicular dendritic cells

Diagnosis: follicular B cell lymphoma,

Note: Grade 3 (by history); patient responded to treatment and the number of centroblasts decreased, now resembles a lower-grade follicular lymphoma under microscopic examination.

Patient is not yet in remission

+++

CONFERENCE 19 (May 2024)

CASE 1:

4 y/o male, admitted with adhesion of multiple neck lymph nodes. Imaging with ultrasound and CT shows widespread lymphadenopathy (bilateral cervical - supraclavicular - mediastinal - lung hilar lymph node; right axillary - abdominal lymph node), 34 mmm in largest dimension. Lab results: LDH: 315 U/L, beta2 microglobulin: 1913 ug/L (normal). Patient was diagnosed with peripheral T cell Lymphoma NOS at outside hospital. Patient was admitted with WBC: 29.9k, Neu: 21.9k, Lym: 4.8k, RBC: 5.35, Hgb: 108 g/L; MCHC: 308, Plt: 260. Patient was treated with chemotherapy for peripheral T cell Lymphoma NOS with decreased size of neck/axillary lymph nodes. WBC: 5.4k, Neu: 4.2k, RBC: 3.76, Hgb: 83 g/L, MCHC: 306, Plt: 314. No blasts in PBS.

Cervical lymph node biopsy at outside hospital:

https://pathpresenter.net/public/presentation/display?token=287193ae

Findings:

Cervical lymph node shows diffuse infiltrate with histiocytic cells, no obvious mitotic figures, histiocytes lacking high-grade atypia, admixed with small lymphocytes, background with scattered small residual follicles

(+) CD45, CD4, ALK1 (subset, not strong), CD68, Ki67 (low, <10%)

(-) CD3, CD79a, CD2, CD5, CD7, CD8, CD10, bcl6, CD21, CD23, CD30, CD1a, S100

Diagnosis: ALK-Pos Histiocytosis

Notes: seen in young patient, systemic involvement, effective treatment with ALK Inhibitor (such as lorlatinib);

ALK gene translocation, most commonly with exon 24 of KIF5B fused to exon 20 of ALK

Excluding other DX s:

-T cell lymphoma, NOS is unlikely due to lack of many T cell markers;

-T lymphoblastic lymphoma is unlikely due to low Ki67, neg CD1a, also lack of many T cell markers

-Langherhan cell histiocytosis is unlikely with neg CD1a, S100, no increased eosinophils in section

A concern for ALK stain: should be cytoplasmic/membrane; the stain in this case appears nuclear?

++++++++++++++++++++++++

CASE 3:

31 y/o male, with ulcer in duodenum having ragged edge, measuring 2/3 of duodenal circumference. Imaging shows many enlarged abdominal lymph nodes and enlarged lymph nodes in liver. Patient is doing poorly (clinically)

Duodenal biopsy:

https://pathpresenter.net/public/presentation/display?token=bdaff103

Findings:

Duodenum biopsy shows diffuse lymphocyte infiltrate in submucosa, small-intermediate lymphocytes, a few lymphoepithelial lesions

(+) CD3, CD5, CD4, CD7 (subset, partial loss), bcl6

(-) CD20, CD8, CD30, bcl2, CD10, CD56, CyclinD1, CD23, PanK

Low Ki67 (<10%)

Diagnosis: PTCL- NOS

Note: indolent T cell lymphoma of GI tract is less likely due to significant clinical symptoms in this young patient

++++++++++++++++++++++

CASE 4:

64 y/o male, with splenic tumor (30 cm), no other lymphadenopathy seen, CBC: WBC 23.6K (Neu: 14K, Lym: 8K), RBC: 3.9K, HGB: 102, PLT: 422K.

Splenic biopsy:

https://pathpresenter.net/public/presentation/display?token=c257cfde

Findings:

Spleen biopsy shows expansion of white pulp, intermediate-large lymphs, scattered eosinophils, scattered mitotic figures

(+) CD4, CD43, CD3 (subset)

(-) CD8, CD20, CD34, CD61, ECadherin, MPO, CD117

[CD8 outlines splenic sinus]

Diagnosis: PTCL- NOS versus ALCL (monomorphic variant)

Suggested IHCs: CD30, ALK1

+++++++++++++++++++++++

CASE 6:

54 y/o male, bilateral neck lymphadenopathy. BM aspirate shows 44% blasts. CBC with many blasts

L neck lymph node:

https://pathpresenter.net/public/presentation/display?token=3cf62e95

Findings:

Diffuse & monotonous infiltrate of pleomorphic cells, intermediate nuclear size, scatter mitotic figures

(+) CD7, CD43, Ki67 (60%), TdT

(-) CD3, CD20, CD2, CD5, CD4, CD8, CD117 (subset), CD34 (?), MPO

BM Bx, Asp:

https://pathpresenter.net/public/presentation/display?token=59ca21e1

Findings:

Monotonous infiltrate of pleomorphic cells, intermediate nuclear size

Flow cytometry:

(+) CD7, CD34, CD56, CD38, CD200

(-) CD2, CD3, CD4, CD8, CD5, TCR-gamma/delta, CD13, CD117 (partial), CD33 (partial), HLA-DR, CD15, CD19, CD10, CD20, K, L, CD11b, CD16, CD14, CD64

Acute leukemia, unlikely AML, B-ALL, T-ALL, blastic plasmacytoid dendritic neoplasm

Diagnosis: likely undifferentiated acute leukemia

Note:

Cannot r/o AML-M7

Suggested IHC for CD41 or CD61

+++++++

CONFERENCE 20 (June 2024)

CASE 1:

60 y/o male, skin ulceration in L inguinal area. Ultrasound shows skin lesion of 47x7 mm with no increase in vasculature, with ulceration, involving surrounding adipose tissue. Many surrounding lymph nodes are seen, thickened capsule (6 mm), umbilical lymph node with size 10-16 mm

Skin biopsy in inguinal area:

https://pathpresenter.net/public/presentation/display?token=f7711e32

Findings:

Dermal infiltrates of large cells, including multinucleated forms, a few mitosis, admixed with small lymphocytes, histiocytes, a few eosinophils; also areas with ulceration

(+) CD3, CD2 (suboptimal), CD4, CD30 (strong), TIA, Granzyme B (partial), Ki67 (70%)

(-) CD20, PAX5, CD5, CD7, CD8, ALK1, CD56, EMA

Diagnosis: Primary cutaneous CD30-positive lymphoproliferative disorder (including lymphomatoid papulosis, primary cutaneous anaplastic large cell lymphoma)

+++++

CASE 2:

43 y/o female, enlarged lymph nodes throughout body

L neck lymph node:

https://dpa-dapa.com/public/presentation/display?token=266de3b9

Findings:

Diffuse infiltrate of large cells including multinucleated forms, a few mitosis, admixed with small lymphocytes, and histiocytes

(+) CD30 (strong), CD3 (likely cytoplasmic), CD5, Ki67 (approaching 60-70%), CD45 (only subset positive only), CD2, CD4, PD1, bcl2

(-) EMA (only subset pos, dim), CD20, ALK (a bit out of focus), CD7 (aberrant loss), CD21, CD23, CD79a, EBV (a bit out of focus), CD10, bcl6, MUM1, cyclinD1, cMyc

CD68: pos for histiocytes

PAX5, Oct2: pos for small B lymphocytes

CD15: out of focus

Diagnosis: Anaplastic large cell lymphoma, ALK-negative

+++++

CASE 3:

50 y/o male, enlarged neck lymph node, CBC: WBC 211k, Lymphocyte 192K, Prolymphocyte 7%. BM Aspirate shows 40% lymphocyte.

Lymph node biopsy:

https://pathpresenter.net/public/presentation/display?token=0d9657cf

Findings:

Scattered HRS-like cells, background of small lymphocytes

HRS-like cells:

(+) CD30

(-) CD3, CD15, CD68

PAX5 out of focus

CD45: difficult to interpret (too crowded)

The HRS-like cells may be activated lymphocytes or true HRS cells

Suggestion: rescan PAX5 (to r/o cHL)-> Rescanned PAX5 did not appear to show HRS cells (dim positivity for PAX5)

Small lymphocytes: include some CD3-pos cells

Suggestion: IHCs for: CD20, CD5, CD23 to r/o CLL/SLL

DX to consider:

-CLL/SLL (most likely)

-CLL/SLL together with cHL

BM Bx, Asp:

https://pathpresenter.net/public/presentation/display?token=9ab80383

Findings:

Large aggregates with small lymphocytes

(+)CD5, CD20, CD79a, PAX5, CD23, bcl2

(-) CD15, CD30, CD10, bcl6, TdT, MPO, CD117

Flow cytometry:

(+) CD5, CD19, CD20, CD79a, CD200, lambda

(-) CD10, CD34, CD38, CD3, CD7, CD4, CD8, kappa, CD2, CD56, TdT

Diagnosis: CLL/SLL

+++++

CONFERENCE 21 (July 2024)

CASE 1:

42 y/o male, in 2022 had a diagnosis of paracortical T cell hyperplasia in supraclavicular lymph node biopsy (2 cm).

Patient had a neck lymph node biopsy in 2/2024:

https://pathpresenter.net/public/presentation/display?token=cb4b0462

Findings:

Vague nodules, mixture of small and large lymphocytes, many with clear/abundant cytoplasm, increased vessels, scattered eosinophils

(+) CD3, CD5, bcl2 (subset), Ki67=20%

(-) CD20, CD10, bcl6, CD23, cyclinD1

Diagnosis: s/o T cell lymphoma, NOS

In 6/2024, patient had multiple abdominal lymphadenopathy:

https://pathpresenter.net/public/presentation/display?token=4f4a1b72

Findings: similar morphology as previous Bx

(+) CD3, CD2 (some areas with false neg?), CD5, CD7 (partial loss), CD8, bcl2 (subset), Ki67=15% (lower, s/p tx)

(-) CD20, PAX5, bcl6 , CD30, CD23, CD4

Diagnosis: s/o CD8-positive T cell lymphoma, NOS

Updated bone marrow biopsy:

https://pathpresenter.net/public/presentation/display?token=5fcf4560

2 foci of lymphoid infiltrates (small-intermediate nuclear size):

(+) CD3, CD2, CD5, CD7, CD8, PD1

(-) CD20, CD4, CD10, bcl6, CD23

Reproduced IHC pattern in previous LN

Diagnosis: CD8-positive T cell lymphoma, NOS

[AITCL is less likely with negative CD4, neg CD10, lack of extended FDV extended meshwork (CD23)]

+++++++

CASE 2:

56 y/o female, colonoscopy showing 3 cm polyps in descending colon.

Excisional biopsy:

https://pathpresenter.net/public/presentation/display?token=00194184

Findings:

H&E section is rather thick; showing follicles that are spaced apart, attenuated mantle zone, increased eosinophils, histiocytes, plasma cells in the background

(+) CD20, CD10, bcl6, CD21, CD23, Ki67=90%(polarized)

(-) CD3, CD5, bcl2, MUM1, cyclinD1

Diagnosis: s/o reactive follicles

+++++++

CASE 3:

62 y/o male, with gastric ulcer and abdominal lymphadenopathy.

Gastric biopsy:

https://pathpresenter.net/public/presentation/display?token=627d8300

Findings:

HRS-like cells, scattered eosinophils

Pos for CD30, PAX5 (dim), Ki67, background T cells CD4>>CD8

Diagnosis: non-diagnostic; difficult to diagnose due to small sample

(HRS-like cells are few and only focally seen)

Additional supraclavicular lymph node biopsy:

https://pathpresenter.net/public/presentation/display?token=c0a3cf41

Findings:

Collagen bands, lymphoid nodules, scattered large cells (s/o HRS cells)

(+) CD30, PAX5 (dim), Ki67

(-) CD3, CD20, CD15 (?)

Diagnosis: s/o classical Hodgkin lymphoma, NS

++++++

CASE 4:

12 y/o female, with multiple lymphadenopathy during the last 12 months, arm skin lesion in the last 6 months.

Ultrasound showed inflammation in lymph nodes and skin lesion. Lab results showed leukopenia and elevated LDH.

Neck lymph node biopsy and skin biopsy:

https://pathpresenter.net/public/presentation/display?token=33e94559

Findings:

Neck lymph node: diffuse patches of foamy histiocytes, some with phagocytosis (RBCs and some leukocytes)

Skin: multiple foci of histiocytes in dermis with similar morphology

LDH is mildly increased, WBC is mildly decreased

Diagnosis: s/o Hemophagocytic lymphohistiocytosis (HLH)

Cannot r/o:

-Disseminated juvenile xanthogranuloma

-ALK-positive histiocytosis

Suggested IHCs: CD4, CD68, ALK1; lab test for ferritin

(Leishmaniasis or Rosai-Dorfman is unlikely without supporting morphology)

+++++++++

CONFERENCE 22 (Aug 2024)

CASE 1:

32 y/o female, with skin lesion

Skin biopsy:

https://pathpresenter.net/public/presentation/display?token=d3b7310f

Findings:

Diffuse, pleomorphic cellular infiltrate, many crush artifacts, mitosis, tangible-body macrophages

(+) CD45, bcl2, CD7, CD4, Ki67 (40%)

(-) CD3, CD20, CD10, bcl6, CD2, CD5, CD8, CD30, ALK, TdT, Myc ?, CyclinD1, MUM1

Diagnosis: peripheral T cell lymphoma (PTCL), NOS

(excluded CD30-pos LPD; excluded B cell lymphoma, excluded histiocytic neoplasm, exclude myeloid sarcoma)

Bone marrow biopsy: https://pathpresenter.net/public/presentation/display?token=9ad53da3

Findings:

Monomorphic cells, diffuse infiltrate

(+) CD45, CD7, CD4, CD43

(-) CD3, CD20, CD2, CD5, CD8, CD30, ALK, CD68 (scattered histiocytes), MPO, TdT

Diagnosis: peripheral T cell lymphoma (PTCL), NOS

++++++

CASE 2:

17 y/o male, left neck lymphadenopathy (2x2 cm)

Neck lymph node biopsy:

https://pathpresenter.net/public/presentation/display?token=d447cb5e

Findings:

CD3, CD20, Ki67 show reactive pattern

Supportive of reactive follicles (positive for CD10, bcl6; and negative for bcl2).

Diagnosis: reactive follicular hyperplasia and sinus hyperplasia, a few primary follicles

+++++

CASE 3:

64 y/o male, axillary and supraclavicular lymphadenopathy

Lymph node biopsy:

https://pathpresenter.net/public/presentation/display?token=71a2c334

Diagnosis: many small primary follicles and a few reactive follicles with appropriate IHC patterns

+++++

CONFERENCE 23 (September 2024)

CASE 1:

74 y/o female with history of multiple-site lymphadenopathy, positive PET/CT, suspected lymphoma. Patient also had skin lesions in legs/soles

Axillary lymph node biopsy:

https://pathpresenter.net/public/presentation/display?token=0a10e113

Findings:

Sinus hyperplasia & paracortical area with histiocytes and atypical large cells; admixed with reactive follicles; scattered pigments

Diagnosis: suspected T cell lymphoma

Suggest IHC (to confirm lymphoma): CD3, CD4, CD8, CD7, CD30, Ki67

(pt with Hx of MF with transformation to large cells in tumor stage; the current morphology is dermatopathic lymphadenopathy as discussed with Dr Thai)

CASE 2:

58 y/o male, diagnosed and treated in 2019 for T cell lymphoma. Chemotherapy was completed a long time back. Now patient developed lymphadenopathy at multiple sites, leukopenia, concern for bone marrow metastasis.

Bone marrow biopsy, supraclavicular lymph node, cervical lymph node:

https://pathpresenter.net/public/presentation/display?token=98c6f614

Findings:

BM: not remarkable; 30-40% cellularity; increase eosinophils

Supraclavicular LN: acellular with a small focus of lymphocytes

Cervical LN: unremarkable morphology, a few reactive follicles; normal IHCs

Diagnosis: no evidence of lymphoma metastasis in submitted samples

If clinical team thinks that bone marrow is involved, any of the following may be pursued:

-PET/CT scan to see hot spots (lesions) and perform localized biopsy

-Examine the peripheral to look for lymphoma cells that may be seen in some cases; followed by flow cytometry

-Repeat bone marrow

-Review bone marrow aspirate for signs of dysplasia. If myelodysplastic syndrome is suspected, pt may need to be referred to Hematology Hospital for full workup

CASE 3:

16 y/o male, several neck masses.

Left neck lymph node, 18mmm

https://pathpresenter.net/public/presentation/display?token=2ccbff88

Findings:

Diffuse infiltrate with monotonous lymphocytes of intermediate size; scattered mitosis and tingible-body macrophages

(+) TdT, CD5, CD7, bcl2, Ki67 (60%)

(-) PAX5, CD2, CD3, CD4, CD8, CD20 (pos in background B cells), CD79a (pos in background B cells), CD10, CD23, cyclinD1

Diagnosis: T cell lymphoblastic lymphoma

[this case has unusually high number of aberrant loss of T cell marker; however the remaining markers are adequate for a DX of T cell Lymphoblastic lymphoma]

+++++

CONFERENCE 24 (Oct 2024)

CASE 1:

58 y/o female

Biopsy of abdominal lesion surrounding the aorta

https://pathpresenter.net/public/presentation/display?token=aef484e3

Findings:

Biopsy shows mostly fibroconnective tissue, scattered aggregates of small lymphocytes (with normal distribution of T cell markers and B cell markers).

Focal infiltrates of plasma cells (positive for CD138)

Suggest IHCs for kappa, lambda, CD56, CD117 to rule out a plasma cell dyscrasia

Updated IHCs: CD56, CD117, Kappa, Lambda ->(-)CD56, CD117; kappa/lambda showed polyclonal plasma cells

->Diagnosis: no definitive DX, likely due to suboptimal sample

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

CASE 2:[not listed]

59 y/o male, admitted with left neck mass (32 mm), no known past medical history

Neck lymph node biopsy:

https://pathpresenter.net/public/presentation/display?token=5c1c70af

Findings:

Diffuse necrosis, many histiocytes, admixed with scattered viable large cells, especially in the central area;

Due to necrosis, IHCs may be falsely pos or falsely neg, making interpretation difficult

(+) CD8, CD3, ki67 (~50%, focally), TIA, Granzyme B

(-) CD4, bcl6, CD10, CD79a, bcl2, ALK, CD56, CD30, CD5, CD2, CD7, CD20

Positive CD68, CD163 mostly in histiocytes?

- With high Ki67: cannot rule out CD8-pos T cell lymphoma (causing much necrosis)-> T cell receptor gene rearrangement by PCR for clonality?

- Suggest AFB/GMS/PAS to exclude infection just in case

- Due to significant necrosis, Kikuchi-Fujimoto disease, and Histiocytic disorders are still kept in the differential diagnosis list

Differential Diagnosis:
- Kikuchi-Fujimoto disease
- Histiocytic disorders
- T cell lymphoma

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

CASE 3:

51 y/o male, admitted in 11/2023 with lower gum lesion, right neck mass (4cm)

Gum biopsy with diagnosis of T cell lymphoma. Patient was treated with chemotherapy (CHOP, 6 cycles, last one in 4/2024):

Diffuse infiltration of pleomorphic intermediate-large sized cells

(+) CD4, CD45, Ki67 (80%)

(-) CD3, CD20, CD30, Pan K

Diff DX with the given IHC results: T cell lymphoma (a minority of cases with negative CD3), Myeloid sarcoma

Patient currently still has gum lesion, unchanged size of right neck mass.

Right lymph node biopsy with diagnosis of myeloid sarcoma, not associated with acute myeloid leukemia:

https://pathpresenter.net/public/presentation/display?token=dd9a633e
Findings:

Diffuse infiltration of pleomorphic intermediate-large size cells

(+) CD4, CD117, Ki67 (80%), TIA(?), bcl2

(-) CD34, MPO, CD3, CD5, CD7, CD2, CD8, CD20, CD56, granzyme B, CD10, ALK1, CD30, TdT, bcl6, MUM1

Diagnosis: myeloid sarcoma

Agree with assessment of myeloid sarcoma (ruled out T cell lymphoma; also consistent with clinical history of lack of response to lymphoma treatment)

Updated: flow cytometry of PB subsequently showed AML. Patient s WBC elevated to >100k and passed away

https://pathpresenter.net/public/presentation/display?token=bbbbc417

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

CASE 4:

21 y/o female, bilateral neck masses (5-19mm)

Right neck mass:

https://pathpresenter.net/public/presentation/display?token=4156e15e

Findings:

Large nodules of lymphoid cells, separated by collagen bands

Large cells with prominent nucleoli, some multi-nucleated, some with lacunar form, background of small lymphocytes and scattered eosinophils

Large cells are:

(+) CD30 [note that IHC loses signals in subset of HRS cells), Pax5 (dim)

(-) CD15, CD3, CD20, CD45

Diagnosis: classical Hodgkin lymphoma, NS

(to confirm with presence of mediastinal mass by imaging)

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

CASE 5:

29 y/o female, imaging showed axillary mass and bilateral supraclavicular mass (10-77mm), salivary gland mass, neck mass (5-26mm), with necrosis.

Right neck mass:

https://pathpresenter.net/public/presentation/display?token=1c20b0de

Findings:

Most follicles with centrocytes in central area and monocytoid lymphocytes in surrounding area (an inverted pattern),

suggestive of follicular lymphoma with marginal zone differentiation

-Suggest IHC for CD10, bcl6, bcl2, Ki67 to confirm pattern of FL; also look for positive CD10 in the central component, whereas the marginal component (monocytoid lymphocytes) is negative

-Suggest t(14;18) by FISH if available

Updated:

Positive CD10 in the central component, whereas the marginal component (monocytoid lymphocytes) is negative

Diagnosis: follicular lymphoma with marginal zone differentiation

-Note that if the surrounding lymphocytes are centroblasts then one needs to consider Reverse Variant of Follicular Lymphoma (RVFL, characterized by dark staining small centrocytes in the center and pale staining large centroblasts at the periphery of the neoplastic follicles

++++++++++++++++++++++++++++++++++++++++++++++++++++++

CASE 6:

48 y/o female, diagnosed with basal cell carcinoma (facial skin biopsy) 8 years prior, subsequent wide-excisional surgery with negative margin.

Patient developed facial skin lesion in the last 12 months, come-and-go nature.

Facial skin biopsy:

https://dpa-dapa.com/public/presentation/display?token=b7ac166b

Findings:

Lymphocytes and histiocytes surrounding benign glands (not micronodular BCC), background of acute inflammation (PMNs).

Histiocytes:

(+) CD4, CD68

(-) CD3, CD5, CD8, CD2, CD7, CD43, CD30, ALK,CD56, CD10, CD1a, Granzyme

Lymphocytes:

Mixture of T and B lymphocytes

Ki67 is focally high, a/w focal aggregates of T lymphocytes ad B lymphocytes; pattern not s/o lymphoma

Diagnosis: acute and chronic inflammation

++++

CONFERENCE 25 (Dec 2024)

CASE 1:

21 y/o male, admitted with left cheek lesion (12cm), attached to left jaw. Lesion was diagnosed as myeloid sarcoma (1^st biopsy). Patient underwent surgery to debulk tumor (2^nd biopsy), now with bone marrow procedure (3^rd biopsy). Patient has normal CBC.

https://pathpresenter.net/public/presentation/display?token=c2af2e63

Findings:

Core BXs: 1^st sample

Diffuse infiltrate with pleomorphic/large cells

(+) CD45, CD34, CD117, MPO (subset), CD68, Ki67 (60%), Vimentin,

(-) CD3, CD20, CD138, CD38, S100, P63, SMA, CD31, Myogenin, MyoD1, Desmin,

Diagnosis: myeloid sarcoma

Resection: 2^nd sample

Similar diffuse infiltrate with additional adipose tissue

(+) CD4, ERG

(-) TdT, CD5, CD2, CD7, CD30, CD8

Diagnosis: myeloid sarcoma

BM BX: 3^rd sample, mostly bone, little intact BM, appears not involved

BM asp: difficult to read

Diagnosis: no bone marrow involvement

Note: myeloid sarcoma with no bone marrow involvement

+++++++++++++++++++++++++++++

CASE 2:

32 y/o male, left axillary mass (2cm), no B symptoms.

Left axillary mass biopsy:

https://pathpresenter.net/public/presentation/display?token=3f53953e

Findings:

Many small follicles and only a few larger ones, follicles are well-spaced apart

Small follicles (primary):

(+) CD20, PAX5, bcl2

(-) CD10, Bcl6, Ki67, MUM1

Larger follicles (Reactive):

(+) CD20, PAX5, CD10, bcl6, Ki67 (high), MUM1

Background of small T lymphocytes pos for CD3, CD5, CD43

Neg CyclindD1, SOX11, CD15, cMYC

CD30: pos for scattered immunoblasts

Diagnosis: reactive lymphoid tissue; no evidence of malignancy

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

CASE 3:

70 s y/o male, diagnosed with lung carcinoma.

Bone marrow biopsy:

https://pathpresenter.net/public/presentation/display?token=2cd73d03

Findings:

Bone marrow biopsy with normocellularity (40%); trilineage hematopoiesis;

no abnormalities (no obvious carcinoma)

Bone marrow aspirate; difficult to read

Diagnosis: no carcinoma metastasis in bone marrow

++++++++++++++++++++++++++++++++++++++++++++

CASE 4:

47 y/o female, with right neck mass, diagnosed with Castleman Disease at outside hospital, s/p ACTEMRA for 3 cycles, now transferred to Cancer Center for further treatment.

Bone marrow:

https://pathpresenter.net/public/presentation/display?token=d4c425c4

Findings:

BM biopsy shows normocellularity (50%) with foci of higher cellularity having increased megakaryocytes, eosinophils, plasma cells

Plasma cells:

(+) CD138, CD38, Lambda restricted

Plasma cells account for about 10%

Diagnosis: s/o plasma cell myeloma

Notes:

-Castleman disease (plasma cell variant) typically does not have monoclonal plasma

-ACTEMRA is indicated for the treatment of adult patients with moderately to severely active rheumatoid arthritis (RA). It may have been used in this case for Castleman disease. It may have decreased plasma cells from a baseline higher than 10%. Plasma cell myeloma cannot be ruled out in this patient.

-Suggested further testing to r/o myeloma: (a) Serum protein electrophoresis and serum protein immunofixation, (b) Assess renal function (Cr), (c) Imaging to r/o lytic bone lesions

+++++++++++++++++++++++++++++++++++++++++++

CASE 5:

30 y/o female, diagnosed with follicular lymphoma 4 years prior (no documentation of diagnosis and treatment), now with left neck mass.

Patient now has left neck mass biopsy (diagnosed with classical Hodgkin lymphoma) and bone marrow (diagnosed with HLH):

https://pathpresenter.net/public/presentation/display?token=239f624d

Findings:

L Neck lymph node:

HRS cells with background of small lymphocytes/histiocytes; HRS cells (including lacuna cells) are:

(+) CD30, CD15, PAX5 (dim), Ki67

(-) CD3, CD20, CD21

Background cells are mostly small T cells (CD3-pos)

Presence of a few collagen bands separating lymphoid nocules

Diagnosis: classical Hodgkin lymphoma, NS

(agree with Cancer Center s diagnosis)

BM:

Hypercellular (90%); appears fibrotic, many histiocytes, with scattered possible HRS cells (not well stained with CD30, PAX5);

Histiocytes pos for CD4/CD68

->No definitive HLH (need to review aspirate for hemophagocytosis; also review ferritin)

->s/o cHL in BM; suggested: reticulin, trichrome (if positive would be enough to call cHL in BM)

Updated: diffuse reticulin fibrosis, supportive of classical Hodgin lymphoma in bone marrow biopsy

Diagnosis: classical Hodgin lymphoma in bone marrow biopsy

+++++++++++++++++++++++++++++++++++++++

CASE 6:

54 y/o male, multiple lymphadenopathy sites (30-39mm), nasopharyngeal v hypopharyngeal lesions, splenomegaly (132mm), elevated LDH (470), normal CBC. Patient was diagnosed with AITCL (no report available)

Bone marrow:

https://pathpresenter.net/public/presentation/display?token=e6751959

Findings:

CBC: mild leukocytosis, mild anemia, normal plt

BM: Normocellular (50%) with trilineage maturation. Small focal clusters of T cells (mixture of CD4-pos and CD8-pos cells)

Diagnosis: no definitive abnormalities in bone marrow

Note: need to review lymph nodes to r/o lymphoma (AITCL)

+++++++++++++++++++++++++++++++++++++++

CASE 7: [not listed]

35 y/o female, soft tissue mass adjacent to nose. Initial diagnosis of Granuloma faciale

Soft tissue mass biopsy:

https://pathpresenter.net/public/presentation/display?token=a683dbb1

Findings:

Swerling clusters of large cells

AE1 / AE3, EMA, p63, p40: all neg, ruled out carcinoma

CD1a, S100: all neg, ruled out LCH

Diagnosis: sinonasal eosinophilic angiocentric fibrosis

(Dr Saluja s consultation)

++++

CONFERENCE 26 (Dec 2024)

CASE 1:

70 y/o female, neck lymphadenopathy (group II to IV), largest dimension 29mm, LDH 408. Multiple previous biopsies showed necrosis with adhesion.

The most recent neck lymph node biopsy:

https://pathpresenter.net/public/presentation/display?token=e0ea9c9d

Findings:

Neck LN:

Diffuse infiltrate with intermediate-large lymphocytes; foci of organizing tissue

(+) CD45, CD3, CD5, CD4 and CD8?, EBER

(-) CD20, PAX5, CD15, CD30 (only scattered pos)

[Scans for CD20 and CD30 are suboptimal]

Diagnosis: s/o PTCL with co-expression of CD4 and CD8

Note: T-prolymphocytic leukemia (T-PLL) cannot be ruled out-> suggestion: check CBC or BM

++++

CASE 2:

19 y/o male, with lung carcinoma, follow-up bone marrow

Bone marrow:

https://pathpresenter.net/public/presentation/display?token=9545126e

Findings:

BM biopsy shows scattered pleomorphic & large cells with prominent nucleoli (not megakaryocytes, not pronormoblasts),

Asp: trilineage hematopoiesis, hard to pick out the abnormal cells

Diagnosis: s/o carcinoma metastasis to bone marrow

Suggested: IHC (Keratin AE1/AE3 to r/o lung CA)

++++

CASE 3:

19 y/o male, diffuse/bilateral lymphadenopathy, LDH: 504 U/L(elevated), beta2 microglobulin: 3728 mcg/L (elevated).

Neck lymph node biopsy and bone marrow:

https://pathpresenter.net/public/presentation/display?token=c0b13b61

Findings:

CBC: normal WBC/Hgb/Plt; high lymphocyte count; no blasts in PBS

Neck LN:

Diffuse monotonous /aggressive/ intermediate size lymphocytes

(+) CD3, CD7, CD43, bcl2, CD34, CD99, Ki67, CD117 (scattered)

(-) CD20, TdT, CD2, CD5, CD56 , MPO, CD10, bcl6, CD1a, CD23, EBV, CD68, MUM1, CyclinD1

Diagnosis: Early T-cell precursor (ETP) lymphoblastic leukaemia (ETP-ALL)

BM:

Sinusoidal infiltrates of malignant cells; asp difficult to read (overstained)

(+) CD7, CD117, CD34, CD4

(-) CD2, CD5, CD8, TdT, MPO, CD20

Diagnosis: Early T-cell precursor (ETP) lymphoblastic leukaemia (ETP-ALL)

++++

CASE 4:

57 y/o female, diffuse lymphadenopathy, including ulcerate neck mass, LDH: 223 U/L (normal), beta2 microglobulin: 5779 mcg/L (elevated). Multiple previous biopsies showed necrosis.

Current inguinal lymph node and bone marrow:

https://pathpresenter.net/public/presentation/display?token=ed3febf4

Findings:

CBC: elevated WBC, PMN/Mono, low Hb/Plt; 4% blasts; no basophilia

CT: no mention of splenomegaly (r/o CML)

Inguinal LN:

Diffuse infiltrates with large /pleomorphic monocytic cells (folded nuclei), admixed with erythroids (hemorrhage); scattered small residual follicles

(+) CD45, CD68, CD163, CD1a, S100, Ki67 (30%)

(-) CD3, CD20, ALK, CD30

CD1a?, S100?->repeat IHCs per Dr Uyen->pos

Diagnosis: Indeterminate dendritic cell tumor in lymph node, also known as indeterminate cell histiocytosis

BM:

Hypercellular, high M/E ratio, many large/pleomorphic monocytic cells (abundant cytoplasm)

(+) CD68

(-)CD3, CD5, S100, CD1a, CD20, PAX5, bcl6, CD10, CD23, bcl2, cyclinD1

Repeated CD1a, S100: neg

Diagnosis: s/o chronic myelomonocytic leukemia (CMML)

[less likelihood of: CML, ALK-pos histiocytosis, AML, ALL(B or T cells)]

Note: patient has 2 concurrent diseases: CMML in bone marrow and Indeterminate dendritic cell tumor in lymph node, also known as indeterminate cell histiocytosis,

a neoplastic proliferation of spindled to ovoid cells with phenotypic features similar to those of normal indeterminate cells, the alleged precursor cells of Langerhans cells.

+++

CONFERENCE 27 (April 2025)

CASE 1:

62 y/o female, diffuse lymphadenopathy, follow-up for involvement of spleen and lungs.

Neck lymph node biopsy (1-2cm):

https://pathpresenter.net/public/presentation/display?token=a0d3eb10

Findings:

Neck lymph node:

Numerous follicles in section; lymphocytes in follicles with more centroblasts than centrocytes, admixed with mitosis,

tangible body macrophages

Follicles are:

(+) CD20, Ki67 (overall 40%, diffuse in follicles, not polarized), CD10, bcl6, CD21, CD23

(-) CD3, CD2, CD5, CD7, CD4, CD8, CD43, bcl2, PD1, CD30, EBV, MUM1, CD138, cMYC, cyclinD1

Diagnosis: s/o Follicular lymphoma, grade 3A (high grade); floral variant

Nodal architecture is effaced by an irregular, nodular proliferation, displaying the floral-like appearance.

The neoplastic follicles are typically surrounded by a prominent mantle zone (positive for bcl2), penetrating

into the center of follicles. Pale and large follicles are infiltrated by darker mantle zone lymphocytes, producing

the so-called floral appearance of follicles

bcl2

Ki67

CD3

CD43

+++

CASE 2:

65 y/o male, diagnosed with non-Hodgkin lymphoma in 2008 (type not known), treated with unknown regiment. This year patient developed right axillary mass (28mm at largest

Dimension), multiple pulmonary nodes (largest dimension 16mm), concerned for lymphoma relapse, LDH: 180 (normal), beta2 microglobulin: 3200 (elevated).

Right axillary mass (core biopsy, open biopsy), bone marrow:

https://pathpresenter.net/public/presentation/display?token=e5a744b9

Findings:

Axillary mass, core BX: diffuse plasma cell infiltrate, presence of many small primary follicles

(+) CD138, CD38, Ki67 (10%)

(-) CD3, CD20, PAX5, CD5, CyclinD1, bcl6, CD23, bcl2, CD10

Axillary mass, open biopsy: diffuse plasma cell infiltrate, presence of many small primary follicles, a few reactive follicles

(+) cytoplasmic lambda restriction

(-) CD138?, CD3, CD5, CD23, CD21

BM report: normal, no plasma cells

Diagnosis: s/o Plasmacytoma (too many plasma cells to be MZL or LPL)

Note: Dr Quang had a great observation that pt was diagnosed with NHL in 2008, now has plasma cell neoplasm.

With 17 years apart, the original NHL was likely in remission and the plasma cell neoplasm does not represent relapse.

++++

CASE 3:

19 y/o female, bilateral neck mass and right axillary mass.

Right neck mass:

https://pathpresenter.net/public/presentation/display?token=6e7e0255

Findings:

Neck mass: Nodules separated by collagen bands, with HRS cells, lacunar cells

(+) CD30, PAX5 (dim)

(-) CD2, CD3, CD4, CD43, CD45, CD8, MUM1?, CD15, CD20, CD5 (out-of-focus), ALK1

Diagnosis: classical Hodgkin lymphoma, NS

++++

CASE 4:

74 y/o female, with abdominal, pelvic and inguinal lymphadenopathy.

Inguinal lymph node biopsy (5cm):

https://pathpresenter.net/public/presentation/display?token=0fce32f3

Findings:

Inguinal lymph node, biopsy: diffuse infiltrate with intermediate lymphocytes, admixed with

many benign histiocytes and small lymphocytes

(+) PAX5, CD79a, bcl6, Ki67 (60%), MUM1, CD45

(-) CD3 (many small T cells), bcl2, CD2, CD5?, CD7, CD4 (pos for T cells and histiocytes), CD8,

CD20?, CD30, CD15, ALK1, CD10

Diagnosis: s/o DLBCL, ABC subtype

(PTCL was ruled out with many small T lymphocytes)

++++

CASE 5:

17 y/o male, bilateral neck mass for 2 years, largest dimension 8cm.

Neck lymph node biopsy (group II-III) with largest dimension 8cm:

https://pathpresenter.net/public/presentation/display?token=170359f7

Findings:

Neck mass: a few reactive follicles admixed with a few primary follicles; some sections show that many germinal centers

are hyalinized/involuted with onion-skin mantle zone (features of Castleman disease, hyaline vascular variant);

interfollicular areas with increased vessel proliferations.

->HIV-associated lymphadenopathy vs. Castleman disease, hyaline vascular variant

From EMR, HIV is negative-> Report the case as Castleman disease, hyaline vascular variant, multicentric

-> Rituximab treatment per clinical team

Diagnosis: Castleman disease, hyaline vascular variant, multicentric

++++

CONFERENCE 28 (May 2025)

CASE 1:

68 y/o female, with right cheek skin lesion, diagnosed as Jessner lymphocytic infiltration at outside hospital.

Cheek skin biopsy:

https://pathpresenter.net/public/presentation/display?token=226222c5

Findings:

Infiltrates of small lymphocytes, admixed with histiocytes, and scattered reactive follicles, with no involvement of the epidermis

Small lymphocytes: CD3-pos, CD4>>CD8, Ki67 =5-10%

Reactive follicles:CD20-pos, Ki67-pos with polarized pattern

Diagnosis: s/o reactive lymphoid tissue (such as Jessner infiltrate)

-suggestion: check for long duration of disease, Lyme disease (Borrelia), drug-induced

+++++

CASE 2:

Female patient, diffuse lymphadenopathy, recently diagnosed as DLBCL, non-GC with

CD20, BCL2, MUM1, BCL6: (+)

CD3, CD5, CYCLIN D1, CD10: (-)
C-MYC (+) 10%
KI67: 70%

Bone marrow:

https://pathpresenter.net/public/presentation/display?token=0554246d

Findings:

BM: 50% cellular

Scattered pos: CD20, CD79a, PAX5, Oct2, CD10 (pos for basement membrane), bcl6 (dim), MUM1, bcl2 (small, incl T cells)

appears neg for DLBCL met

Diagnosis: negative for DLBCL metastasis to bone marrow

+++++

CASE 3:

65 y/o female

CBC & Bone marrow:

https://pathpresenter.net/public/presentation/display?token=985cc245

Findings:

CBC: leukocytosis, anemia, thrombocytopenia

BM BX: hypercellular (>90%), diffuse distribution of intermediate-large cells with prominent nucleoli

BM Aspirate: numerous blasts

Diagnosis: s/o acute leukemia (ALL vs AML)

Flow would be the best diagnostic test

Without flow, suggested IHC:

-For AML: MPO, CD34, CD43, CD117, CD4

-For ALL: CD79a, [CD34], CD3, [CD4], CD8, TdT

Updated: Oncology sent BM sample for flow, updated results:

Flow cytometry showed that the blasts are:

(+) CD34, CD33, CD123 (partial), CD13 (partial)

(-) CD15, TdT, MPO

Diagnosis: acute myeloid leukemia

++++++

CASE 4:

50 y/o male, with lymphadenopathy (neck, left pelvic), largest dimension 2cm.

Neck lymph node biopsy:

https://pathpresenter.net/public/presentation/display?token=d54e0951

Findings:

HRS-like cells, incl lacunar forms, background of small lymphocytes

(+) Pax5 (strong), CD20, Oct2, MUM1

(-) CD3, CD45?, CD15, CD30 x2, CD79a?

Diagnosis: s/o DLBCL with aberrant loss of CD45 and CD79a

Notes:

-ruled out cHL (PAX5 not dim, CD30 neg, CD20 pos)

-ruled out plasmablastic lymphoma (CD20 pos)

-ruled out ALK1 pos DLBCL (CD20 pos)

-a small area in section shows CD30 positive cells (a mixture of small and large cells). This brings up possibility

of gray-zone lymphoma (cHL/DLBCL). However, imaging study did not show mediastinal mass (supposedly primary site for gray-zone lymphoma)

+++++

CASE 5:

72 y/o male with weight loss, diffuse lymphadenopathy. Imaging showed hepatosplenomegaly. PBS showed <5% blasts

CBC & BM Bx:

https://pathpresenter.net/public/presentation/display?token=c3937548

Findings:

PB: mild leukocytosis, anemia; borderline eos, basophilia, normal platelets

BM asp: M/E ratio is not high?

BM Bx: 90% cellularity (hypercellular), increased megs with hypolobated nuclei, thickened paratrabecular layers (>3 layers)

increased eosinophils, difficult to evaluate baso in BM BX without stains

Diagnosis: s/o CML

Suggested: bcr::abl1 by FISH (PB or BM Clot, not decalcified Bx)

+++++