Hematopathology — MCQs

A 52-year-old man presents with fatigue. Physical examination is normal, but his hemoglobin is low at 8.9 mg/dL. The reticulocyte count is 0.5%, serum iron and TIBC are normal, and ferritin is elevated. A bone marrow aspirate reveals erythroid precursors with accumulated abnormal amounts of mitochondrial iron. For this patient with hypochromic microcytic anemia, what is the most likely diagnosis?

Q175Medium

Histologic sections from a rapidly enlarged cervical lymph node in a 35-year-old female reveal a diffuse, monotonous proliferation of small, noncleaved lymphocytes, which are forming a "starry sky" appearance because numerous tingible-body macrophages are present. A touch prep reveals that many of these cells have cytoplasmic vacuoles. Which stain would most likely react with these cytoplasmic vacuoles?

Q176Easy

Punctate basophilia is characteristically seen in which condition?

Q177Easy

Sideroblasts are seen in which of the following conditions?

Q178Easy

In a-thalassemia, what is the underlying molecular defect regarding globin chain production?

Q179Easy

Autoimmune hemolytic anemia is associated with malignancy of which cell lineage?

Q180Easy

Which of the following immunophenotypic markers is characteristic of mantle cell lymphoma?

Hematopathology Indian Medical PG Practice Questions and MCQs

Question 171: A 23-year-old woman presents with cervical and mediastinal lymphadenopathy. Biopsy of a cervical lymph node reveals a nodular appearance with fibrous bands, effacement of the lymph node architecture, and numerous lacunar cells. Which of the following is true regarding this disorder?

A. Benign neoplasm
B. Frequent association with EBV infection
C. Lacunar cells are positive for CD20 and CD45
D. Relatively favorable clinical course (Correct Answer)

Explanation: **Diagnosis: Hodgkin Lymphoma, Nodular Sclerosis Subtype (NSHL)** **1. Why the Correct Answer is Right:** The clinical presentation (young female, mediastinal involvement) and histopathology (fibrous bands, nodular pattern, and **lacunar cells**) are pathognomonic for **Nodular Sclerosis Hodgkin Lymphoma** [1], [2]. Among the classical Hodgkin lymphoma (cHL) subtypes, NSHL is the most common and is associated with a **relatively favorable clinical course** and an excellent prognosis with current chemotherapy regimens [3]. **2. Why the Incorrect Options are Wrong:** * **Option A:** Hodgkin Lymphoma is a **malignant** lymphoid neoplasm, not benign. * **Option B:** Unlike the Mixed Cellularity subtype (which has a ~70% association), NSHL has the **lowest association with EBV** (only ~10-40% of cases) [3]. * **Option C:** Lacunar cells are a variant of Reed-Sternberg (RS) cells [1]. In classical HL, these cells are characteristically **CD15+ and CD30+**, but **negative for CD20 and CD45** (LCA). CD20/CD45 positivity is seen in Nodular Lymphocyte Predominant HL (NLPHL). **3. High-Yield Facts for NEET-PG:** * **NSHL** is the most common subtype of HL overall and the only subtype more common in females [2]. * **Lacunar Cells:** RS cell variants seen in formalin-fixed tissue where the cytoplasm retracts, leaving the nucleus in a clear "lacuna" (space) [1]. * **Reed-Sternberg Cell Markers:** CD15+, CD30+, PAX5+ (weak), CD45-, CD20-. * **Bimodal Age Distribution:** HL typically shows peaks in the 20s and 50s. * **Staging:** The Ann Arbor Staging system is used; the presence of "B symptoms" (fever, night sweats, weight loss) indicates a worse prognosis [4]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, p. 616. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 558-559. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 616-618. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 557-558.

Question 172: Warm antibody hemolytic anemia is seen in all of the following except?

A. Methyl dopa
B. Penicillin
C. Quinidine
D. Stibophen (Correct Answer)

Explanation: **Explanation:** Drug-induced immune hemolytic anemia (DIIHA) is categorized based on the mechanism of antibody formation. **Warm antibody hemolytic anemia** is typically mediated by IgG antibodies that react at body temperature (37°C) [2]. **Why Stibophen is the correct answer:** Stibophen (along with Quinine and Quinidine) is the classic example of the **"Immune Complex" (Innocent Bystander) mechanism**. In this type, the drug binds to a plasma protein to form a neoantigen, stimulating IgM or IgG production. These drug-antibody complexes then settle on the red blood cell (RBC) surface and activate the **complement cascade**, leading to acute intravascular hemolysis. While Quinidine can rarely cause warm IgG-mediated hemolysis, Stibophen is the quintessential example of the immune-complex/complement-mediated pathway, which is distinct from the pure "warm" autoantibody mechanism. **Analysis of other options:** * **Methyl dopa:** Causes a true **Autoimmune mechanism**. It alters the Rh antigens on RBCs, leading to the production of warm IgG autoantibodies against native RBC antigens [1]. * **Penicillin:** Operates via the **Hapten/Drug-adsorption mechanism**. The drug binds to the RBC membrane; antibodies (warm IgG) then target the penicillin-membrane complex, leading to extravascular hemolysis in the spleen [1]. * **Quinidine:** While primarily associated with the immune complex mechanism (like Stibophen), it is frequently grouped with drugs that trigger warm-reactive antibodies in broader classifications, making Stibophen the most specific "except" choice in classic pathology texts [1]. **NEET-PG High-Yield Pearls:** * **Direct Antiglobulin Test (DAT/Coombs):** Positive in all the above, but Methyl dopa causes a positive DAT even in the absence of hemolysis [1]. * **Warm AIHA:** IgG mediated, extravascular hemolysis (spleen), associated with SLE and CLL [2]. * **Cold AIHA:** IgM mediated, intravascular hemolysis, associated with *Mycoplasma pneumoniae* and Infectious Mononucleosis. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 651-652. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 602-603.

Question 173: Pancytopenia with a cellular marrow is seen in all except?

A. Paroxysmal nocturnal hemoglobinuria (PNH)
B. Megaloblastic anemia
C. Myelodysplastic syndrome
D. Congenital dyserythropoietic anemia (Correct Answer)

Explanation: The hallmark of **Pancytopenia with a Cellular Marrow** is ineffective hematopoiesis, where the bone marrow is hypercellular or normocellular, but the cells fail to mature or enter the peripheral circulation effectively. **Why Option D is Correct:** **Congenital Dyserythropoietic Anemia (CDA)** is a group of rare hereditary disorders characterized by **ineffective erythropoiesis** and specific morphological abnormalities in erythroblasts (like binuclearity). Crucially, CDA typically presents with **isolated refractory anemia**, not pancytopenia. While the marrow is hypercellular, the defect is specific to the erythroid lineage; leukocytes and platelets are generally produced normally. **Why the other options are incorrect:** * **Megaloblastic Anemia:** Vitamin B12/Folate deficiency leads to impaired DNA synthesis. The marrow is hypercellular with "megaloblasts," but cells undergo intramedullary destruction, resulting in peripheral pancytopenia [1]. * **Myelodysplastic Syndrome (MDS):** Characterized by clonal stem cell defects leading to "dysplastic" maturation [2]. The marrow is typically hypercellular, but the cells are functionally defective and die via apoptosis before reaching the blood, causing pancytopenia [2]. * **Paroxysmal Nocturnal Hemoglobinuria (PNH):** While often associated with aplastic anemia (hypocellular), PNH can present with a cellular marrow during phases of brisk hemolysis or when it evolves from/into MDS [3]. It is a classic cause of pancytopenia with variable marrow cellularity [3]. **NEET-PG High-Yield Pearls:** * **Common causes of Pancytopenia with Hypercellular Marrow:** Megaloblastic anemia (Most common), MDS, Aleukemic leukemia, Subleukemic leukemia, and Visceral Leishmaniasis (Kala-azar) [4]. * **Common causes of Pancytopenia with Hypocellular Marrow:** Aplastic anemia, Hypoplastic MDS, and Fanconi Anemia [3]. * **CDA Type II** is the most common type and is also known as **HEMPAS** (Hereditary Erythroblastic Multinuclearity with Positive Acidified Serum test). **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 592-595. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 613-614. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 595-596. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 662-663.

Question 174: A 52-year-old man presents with fatigue. Physical examination is normal, but his hemoglobin is low at 8.9 mg/dL. The reticulocyte count is 0.5%, serum iron and TIBC are normal, and ferritin is elevated. A bone marrow aspirate reveals erythroid precursors with accumulated abnormal amounts of mitochondrial iron. For this patient with hypochromic microcytic anemia, what is the most likely diagnosis?

A. Iron deficiency anemia
B. Beta-thalassemia trait
C. Anemia of chronic disease
D. Sideroblastic anemia (Correct Answer)

Explanation: **Explanation:** The hallmark of this case is the presence of **erythroid precursors with accumulated mitochondrial iron** in the bone marrow, which are known as **ring sideroblasts**. **1. Why Sideroblastic Anemia is correct:** Sideroblastic anemia results from a defect in **heme synthesis**, specifically the failure to incorporate iron into the protoporphyrin ring. This leads to an iron overload within the mitochondria that encircle the nucleus of developing erythroblasts. Key diagnostic features present in this patient include: * **High Ferritin:** Reflects systemic iron overload (iron is available but cannot be used). * **Low Reticulocyte Count:** Indicates ineffective erythropoiesis. * **Ring Sideroblasts:** Pathognomonic finding on Prussian blue staining of bone marrow. **2. Why other options are incorrect:** * **Iron Deficiency Anemia (IDA):** Characterized by *low* ferritin and *high* TIBC. Bone marrow would show a complete absence of stainable iron [1]. * **Beta-Thalassemia Trait:** While microcytic, it typically presents with a high RBC count and target cells. Iron studies are usually normal, and bone marrow does not show ring sideroblasts [3]. * **Anemia of Chronic Disease (ACD):** While ferritin is high, iron is trapped inside macrophages (reticuloendothelial system), not specifically within the mitochondria of erythroid precursors as ring sideroblasts [2]. [4] **Clinical Pearls for NEET-PG:** * **Stain of choice:** Prussian Blue (Perl’s stain) is used to visualize ring sideroblasts. * **Common Causes:** Alcoholism (most common), Lead poisoning, Vitamin B6 (Pyridoxine) deficiency (isoniazid therapy), and MDS (RARS). * **Key Enzyme:** The most common inherited form involves a mutation in **ALAS2** (delta-aminolevulinate synthase). **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 590-591. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 660-662. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, p. 648. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 587-588.

Question 175: Histologic sections from a rapidly enlarged cervical lymph node in a 35-year-old female reveal a diffuse, monotonous proliferation of small, noncleaved lymphocytes, which are forming a "starry sky" appearance because numerous tingible-body macrophages are present. A touch prep reveals that many of these cells have cytoplasmic vacuoles. Which stain would most likely react with these cytoplasmic vacuoles?

A. Myeloperoxidase
B. Oil red O (Correct Answer)
C. Nonspecific esterase
D. Chloracetate esterase

Explanation: ### Explanation **Correct Answer: B. Oil red O** **1. Why Oil Red O is Correct:** The clinical presentation (rapidly enlarging lymph node) and histology (diffuse proliferation of small non-cleaved cells with a "starry sky" appearance) are classic for **Burkitt Lymphoma** [1]. The "starry sky" is created by tingible-body macrophages ingesting apoptotic debris amidst a sea of highly proliferative B-cells [1]. On a touch preparation (cytology), Burkitt cells characteristically show intense basophilic cytoplasm with multiple **clear cytoplasmic vacuoles**. These vacuoles contain **neutral lipids**. Since **Oil Red O** is a specialized stain used to identify neutral lipids and triglycerides, it will react positively with these vacuoles, staining them bright red. **2. Why Incorrect Options are Wrong:** * **A. Myeloperoxidase (MPO):** This is a marker for myeloid lineage. It is used to diagnose Acute Myeloid Leukemia (AML) and would be negative in a B-cell lymphoma like Burkitt’s. * **C. Nonspecific Esterase (NSE):** This stain is primarily used to identify cells of monocytic lineage (e.g., Acute Monocytic Leukemia). * **D. Chloracetate Esterase (Specific Esterase):** This is used to identify granulocytic differentiation in precursors (neutrophilic lineage) and is negative in lymphoid malignancies. **3. High-Yield Clinical Pearls for NEET-PG:** * **Genetics:** Burkitt Lymphoma is associated with the **t(8;14)** translocation, leading to the overexpression of the **c-MYC** proto-oncogene. * **Morphology:** It has the highest proliferation rate among tumors (Ki-67 index approaching 100%) [1]. * **Variants:** * *Endemic (African):* Associated with EBV; typically involves the jaw. * *Sporadic:* Often involves the ileocecal region or abdominal lymph nodes. * *Immunodeficiency-associated:* Often seen in HIV patients. * **Immunophenotype:** CD19+, CD20+, CD10+, and BCL-6+ (Germinal center origin), but **BCL-2 negative** (unlike follicular lymphoma). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, p. 606.

Question 176: Punctate basophilia is characteristically seen in which condition?

A. Lead poisoning (Correct Answer)
B. Acute myeloid leukaemia
C. Chronic myeloid leukaemia
D. Megaloblastic anaemia

Explanation: **Explanation:** **Punctate basophilia**, also known as **Basophilic Stippling**, refers to the presence of numerous fine or coarse blue-violet granules within the cytoplasm of erythrocytes on a peripheral blood smear. These granules represent **pathological aggregates of ribosomes and RNA**. **Why Lead Poisoning is the Correct Answer:** In lead poisoning (Plumbism), lead inhibits the enzyme **5'-nucleotidase**, which is responsible for the degradation of ribosomal RNA in maturing red cells [1]. This inhibition leads to the persistence and abnormal clustering of ribosomal fragments, manifesting as coarse basophilic stippling [1]. While it can be seen in other conditions, it is considered a classic, high-yield diagnostic hallmark of lead poisoning. **Analysis of Incorrect Options:** * **Acute Myeloid Leukaemia (AML):** Characterized by the presence of myeloblasts and **Auer rods**. Basophilic stippling is not a defining feature. * **Chronic Myeloid Leukaemia (CML):** Characterized by a "spectrum of myeloid cells" (myelocytes, metamyelocytes) and marked basophilia (increased basophil count), but not punctate basophilia of RBCs. * **Megaloblastic Anaemia:** While fine stippling can occasionally occur due to dyserythropoiesis, the hallmark findings are **Hypersegmented Neutrophils** and **Macro-ovalocytes** [2]. **NEET-PG High-Yield Pearls:** 1. **Differential Diagnosis for Basophilic Stippling:** Lead poisoning (coarse), Sideroblastic anemia, Arsenic poisoning, and **Thalassemia** (fine stippling). 2. **Lead Poisoning Enzymes:** Lead inhibits **ALA Dehydratase** and **Ferrochelatase**, leading to increased Free Erythrocyte Protoporphyrin (FEP) [1]. 3. **Clinical Sign:** Look for "Burtonian lines" (bluish-grey lead lines on gums) in clinical vignettes [1]. 4. **Stain:** Basophilic stippling is visualized using routine Romanowsky stains (Leishman or Giemsa). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, pp. 418-419. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 592-593.

Question 177: Sideroblasts are seen in which of the following conditions?

A. Thalassemia
B. Myelofibrosis (Correct Answer)
C. Alcoholism
D. Iron overload

Explanation: **Explanation:** **Sideroblasts** are nucleated erythroblasts (precursors) in the bone marrow that contain non-hemoglobin iron granules within their cytoplasm. While they can be seen in various conditions, their presence in **Myelofibrosis** (Option B) is a high-yield association for NEET-PG. In Primary Myelofibrosis, the distorted marrow architecture and extramedullary hematopoiesis lead to ineffective erythropoiesis and disordered iron utilization, frequently resulting in the presence of sideroblasts in the marrow aspirate [1]. **Analysis of Options:** * **Myelofibrosis (Correct):** Characterized by marrow fibrosis and "dry tap" [2]. Sideroblasts are a recognized feature of the dysplastic erythropoiesis seen in myeloproliferative neoplasms [1]. * **Thalassemia:** While iron overload occurs due to repeated transfusions, the hallmark is "target cells" and microcytic hypochromic anemia. Sideroblasts are not a primary diagnostic feature. * **Alcoholism:** Chronic alcohol use is a common cause of **Ring Sideroblasts** (iron in mitochondria surrounding the nucleus), but "Sideroblasts" as a general term in this specific MCQ context is classically linked to Myelofibrosis or Sideroblastic Anemia. * **Iron Overload:** This leads to increased systemic hemosiderin and ferritin, but the specific cellular morphology of a "sideroblast" refers to the erythroid precursor's handling of iron, not just the presence of excess body iron. **NEET-PG High-Yield Pearls:** * **Ring Sideroblasts:** Defined as having $\geq$ 5 iron granules covering at least one-third of the nuclear circumference. Seen in **Sideroblastic Anemia** (Hereditary/Lead poisoning/Isoniazid) and **MDS (RARS)**. * **Stain:** **Perls’ Prussian Blue** is the gold standard to visualize sideroblasts. * **Myelofibrosis Triad:** Leukoerythroblastic blood picture, Teardrop cells (Dacrocytes), and Massive Splenomegaly [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 628-629. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 614-616.

Question 178: In a-thalassemia, what is the underlying molecular defect regarding globin chain production?

A. Excess a-chain production
B. No a-chain production (Correct Answer)
C. Excess 13-chain production
D. No 13-chain production

Explanation: The thalassemias are a group of hereditary hemolytic anemias characterized by a **quantitative defect** in the synthesis of globin chains [1]. **1. Why the Correct Answer is Right:** In **$\alpha$-thalassemia**, there is a reduced or total absence of $\alpha$-globin chain synthesis, usually due to **gene deletions** on Chromosome 16 [2]. When $\alpha$-chains are absent or deficient, the body cannot form normal adult hemoglobin ($HbA: \alpha_2\beta_2$). The hallmark of the disease is the relative deficiency of $\alpha$-chains, leading to the formation of unstable homotetramers of the remaining available chains [2]. **2. Analysis of Incorrect Options:** * **Option A (Excess $\alpha$-chain production):** This does not occur in thalassemia. In fact, it is the *deficiency* of $\alpha$-chains that causes the pathology. * **Option C (Excess $\beta$-chain production):** While there is a *relative* excess of $\beta$-chains compared to $\alpha$-chains in $\alpha$-thalassemia, the primary molecular defect is the **underproduction of $\alpha$**, not the overproduction of $\beta$. The $\beta$-chains simply accumulate because they have no $\alpha$-partners to bind with [2]. * **Option D (No $\beta$-chain production):** This describes **$\beta$-thalassemia**, which is typically caused by point mutations on Chromosome 11, rather than deletions. **3. High-Yield Clinical Pearls for NEET-PG:** * **Molecular Mechanism:** $\alpha$-thalassemia is mostly due to **gene deletions**; $\beta$-thalassemia is mostly due to **point mutations**. * **Hb Barts:** A homotetramer of four gamma chains ($\gamma_4$), seen in Hydrops Fetalis (4-gene deletion) [2]. * **HbH Disease:** A homotetramer of four beta chains ($\beta_4$), seen in 3-gene deletions [2]. On peripheral smear, these appear as **"Golf ball cells"** with brilliant cresyl blue stain. * **Chromosome:** $\alpha$-globin genes are on **Chromosome 16** (4 genes total); $\beta$-globin genes are on **Chromosome 11** (2 genes total). **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 587-588. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 649-650.

Question 179: Autoimmune hemolytic anemia is associated with malignancy of which cell lineage?

A. T cell
B. B cell (Correct Answer)
C. Pre B cell
D. Pre T cell

Explanation: **Explanation:** **1. Why B cell is correct:** Autoimmune Hemolytic Anemia (AIHA) is caused by the production of autoantibodies (IgG or IgM) against red blood cell antigens. Since **B lymphocytes** are the precursors to plasma cells, which are responsible for antibody production, malignancies of the B-cell lineage are most frequently associated with AIHA [1]. The most classic association is with **Chronic Lymphocytic Leukemia (CLL)** and **Small Lymphocytic Lymphoma (SLL)** [1]. In these conditions, the neoplastic B cells or associated immune dysregulation lead to the loss of self-tolerance and the secretion of pathogenic autoantibodies [2]. **2. Why other options are incorrect:** * **T cell & Pre-T cell:** While T-cell malignancies (like T-cell lymphomas) can cause immune dysregulation, they do not directly produce antibodies. AIHA is rarely a primary feature of T-cell tumors compared to B-cell neoplasms [3]. * **Pre-B cell:** These are immature cells found in the bone marrow (e.g., in B-ALL). While they belong to the B-lineage, they are generally too undifferentiated to secrete functional or pathogenic antibodies. AIHA is typically associated with **mature, peripheral B-cell** malignancies [3]. **3. High-Yield Clinical Pearls for NEET-PG:** * **Evans Syndrome:** The clinical triad/combination of AIHA and Immune Thrombocytopenic Purpura (ITP). * **Warm AIHA:** Associated with IgG; usually extravascular hemolysis; linked to CLL and SLE [1]. * **Cold AIHA:** Associated with IgM; usually intravascular hemolysis; linked to *Mycoplasma pneumoniae*, Infectious Mononucleosis, and B-cell lymphomas [2]. * **Direct Coombs Test:** The gold standard diagnostic test for AIHA (detects antibodies/complement bound to the RBC surface). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, p. 602. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 609-610. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 596-598.

Question 180: Which of the following immunophenotypic markers is characteristic of mantle cell lymphoma?

A. CD5+, CD25-
B. CD5+, CD10+
C. CD5+, CD23+
D. CD5+, CD23- (Correct Answer)

Explanation: **Explanation:** Mantle Cell Lymphoma (MCL) is a B-cell neoplasm characterized by the proliferation of small to medium-sized lymphocytes originating from the follicular mantle zone [1]. The hallmark of MCL is the chromosomal translocation **t(11;14)**, leading to the overexpression of **Cyclin D1** [1]. **Why Option D is Correct:** Mantle cell lymphoma typically expresses pan-B-cell markers (CD19, CD20) and is characteristically **CD5 positive** but **CD23 negative** [1]. This "CD5+, CD23-" profile is the most critical diagnostic feature used to distinguish it from Chronic Lymphocytic Leukemia (CLL/SLL). **Analysis of Incorrect Options:** * **Option A (CD5+, CD25-):** While MCL is CD25 negative, CD25 positivity is a classic marker for Hairy Cell Leukemia and Adult T-cell Leukemia/Lymphoma (ATLL). * **Option B (CD5+, CD10+):** CD10 is a germinal center marker. Follicular Lymphoma and Burkitt Lymphoma are CD10+, but they are typically CD5 negative. * **Option C (CD5+, CD23+):** This is the classic immunophenotype for **CLL/SLL**. The presence of CD23 is the primary flow cytometry finding that differentiates CLL from MCL [1]. **High-Yield Clinical Pearls for NEET-PG:** 1. **Genetics:** t(11;14) involving the *CCND1* gene and *IGH* locus [1]. 2. **Morphology:** Look for "pink" histiocytes and a lack of transformed centroblasts (unlike Follicular Lymphoma) [1]. 3. **Variant:** The **Blastoid variant** is highly aggressive with a high mitotic index [1]. 4. **Gastrointestinal Involvement:** MCL can present as **Lymphomatous Polyposis** (multiple polyps in the GI tract). 5. **Marker:** **SOX11** is a highly specific nuclear marker for MCL, especially useful in Cyclin D1-negative cases. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 610-612.

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Anemias: Classification and Approach

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Hemolytic Anemias

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Myeloproliferative Neoplasms

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Myelodysplastic Syndromes

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Acute Leukemias

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Chronic Leukemias

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Lymphomas and Lymphoid Neoplasms

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Plasma Cell Disorders

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Bleeding Disorders

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