Hematopathology — MCQs

Hematopathology Indian Medical PG Practice Questions and MCQs

Question 411: Cold agglutinins are directly against which of the following RBC antigens?

A. P antigen
B. I antigen (Correct Answer)
C. Le antigen
D. Rh antigen

Explanation: **Explanation:** **Cold Agglutinins** are IgM autoantibodies that react with Red Blood Cell (RBC) antigens at temperatures below 37°C (optimally at 0–4°C) [1]. 1. **Why Option B is Correct:** The majority of Cold Agglutinin Disease (CAD) cases are mediated by IgM antibodies directed against the **I antigen** (found on adult RBCs) or, less commonly, the **i antigen** (found on fetal/cord RBCs). * **Infections:** Classically associated with *Mycoplasma pneumoniae* (anti-I) and Infectious Mononucleosis/EBV (anti-i). * **Mechanism:** These antibodies cause RBC agglutination in cooler peripheral circulation (fingers, toes, ears), leading to Raynaud-like symptoms and complement-mediated extravascular hemolysis [1]. 2. **Why Other Options are Incorrect:** * **Option A (P antigen):** Antibodies against the P antigen (Donath-Landsteiner antibodies) are IgG, not IgM. They are associated with **Paroxysmal Cold Hemoglobinuria (PCH)**, often following viral infections in children. * **Option C (Le/Lewis antigen):** These are carbohydrate antigens secreted into body fluids and adsorbed onto RBCs. While Lewis antibodies can be IgM, they are not the primary target in Cold Agglutinin Disease. * **Option D (Rh antigen):** Antibodies against Rh antigens (e.g., anti-D) are typically **warm-reacting IgG** [2] antibodies, associated with Warm Autoimmune Hemolytic Anemia (WAIHA) [2] or Hemolytic Disease of the Newborn [3]. **High-Yield Clinical Pearls for NEET-PG:** * **Direct Coombs Test (DAT):** In Cold Agglutinin Disease, the DAT is positive for **C3b/C3d** only (IgM dissociates at warm temperatures, leaving only complement on the cell). * **Peripheral Smear:** Shows characteristic **RBC clumps/agglutination** (unlike Rouleaux, which is linear). * **MCV Artifact:** Automated counters may show a falsely elevated Mean Corpuscular Volume (MCV) due to RBC clumping. Warm the blood sample to resolve this. **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. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 627-628.

Question 412: The 5-year survival rate is maximum in which of the following hematological malignancies?

A. Mantle cell lymphoma
B. Diffuse large B cell lymphoma
C. Burkitt's lymphoma
D. Anaplastic large T cell lymphoma (Correct Answer)

Explanation: **Explanation:** The correct answer is **Anaplastic Large Cell Lymphoma (ALCL)**, specifically the **ALK-positive** subtype. In the context of the provided options, ALCL (particularly in pediatric and young adult populations) carries the most favorable prognosis [1]. **1. Why Anaplastic Large Cell Lymphoma (ALCL) is correct:** ALCL is a T-cell lymphoma characterized by "hallmark cells" (horseshoe-shaped nuclei) and CD30 positivity. The prognosis is heavily dependent on the expression of the **ALK (Anaplastic Lymphoma Kinase) protein** due to the t(2;5) translocation [2]. ALK-positive ALCL has an excellent response to chemotherapy, with a 5-year survival rate of approximately **70-80%**, which is higher than the other aggressive lymphomas listed [1]. **2. Why the other options are incorrect:** * **Mantle Cell Lymphoma (MCL):** Historically carries a poor prognosis with a median survival of 3-5 years. It is often aggressive and difficult to cure, characterized by t(11;14) and Cyclin D1 overexpression. * **Diffuse Large B-Cell Lymphoma (DLBCL):** While potentially curable with R-CHOP, the 5-year survival varies (roughly 60-70%) [3]. It is generally considered to have a slightly lower survival rate compared to ALK+ ALCL [1]. * **Burkitt’s Lymphoma:** A highly aggressive B-cell lymphoma with a very high proliferation index (Ki-67 ~100%). While highly chemo-sensitive, its extremely rapid doubling time makes it clinically volatile, though many children and young adults can be cured [4]. **3. NEET-PG High-Yield Pearls:** * **ALK Protein:** The single most important prognostic factor in ALCL. ALK-positive = Good prognosis; ALK-negative = Poor prognosis [1]. * **CD30 (Ki-1):** The definitive marker for ALCL. * **Translocation:** t(2;5) involving the *NPM-ALK* fusion gene is characteristic [2]. * **Hallmark Cells:** Large cells with eccentric, kidney-shaped nuclei and a prominent perinuclear eosinophilic Golgi zone. **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. 612-613. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 565-566. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 563-564. [4] 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. 605-606.

Question 413: Hereditary spherocytosis is caused by mutations in which of the following proteins?

A. Ankyrin
B. Band 3
C. Spectrin
D. All of the above (Correct Answer)

Explanation: **Explanation:** Hereditary Spherocytosis (HS) is an autosomal dominant (most common) or recessive disorder characterized by a defect in the red blood cell (RBC) membrane proteins. The primary pathology involves a **deficiency or dysfunction in the vertical interactions** between the membrane skeleton and the lipid bilayer [1]. **Why "All of the above" is correct:** The RBC membrane stability relies on a complex of proteins. Mutations in any of the following can lead to the destabilization of the lipid bilayer, resulting in the loss of membrane fragments (microvesiculation) and the formation of spherical, rigid cells (spherocytes) [1]: * **Ankyrin:** The most common protein mutation in HS (approx. 50% of cases). It anchors the spectrin cytoskeleton to the integral membrane protein, Band 3 [1]. * **Band 3:** A major transmembrane protein. Mutations here are a frequent cause of autosomal dominant HS [1]. * **Spectrin (Alpha and Beta):** These form the horizontal framework of the cytoskeleton. Defects lead to weakened vertical stability [1]. * **Protein 4.2:** Another common site of mutation, often associated with Band 3 defects [1]. **Clinical Pearls for NEET-PG:** * **Pathophysiology:** Loss of membrane surface area → Spherocytes → Trapping and destruction in **splenic cords** (extravascular hemolysis) [1], [2]. * **Diagnosis:** * **Gold Standard/Most Sensitive:** Eosin-5-maleimide (EMA) binding test (Flow cytometry). * **Classic Test:** Osmotic Fragility Test (increased fragility) [2]. * **Peripheral Smear:** Spherocytes (small, dark RBCs lacking central pallor) and Polychromasia (reticulocytosis) [2]. * **Laboratory:** Increased **MCHC** (highly characteristic), increased indirect bilirubin, and negative Direct Coombs Test (to rule out Autoimmune Hemolytic Anemia). * **Treatment of Choice:** Splenectomy (indicated in moderate to severe cases to prevent gallstones and hemolytic crises) [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 640-641. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 597-598.

Question 414: Alder-Reilly bodies are seen in which of the following conditions?

A. Langerhans cell histiocytosis
B. Mucopolysaccharidosis (Correct Answer)
C. Alport syndrome
D. Chediak-Higashi syndrome

Explanation: **Explanation:** **Alder-Reilly bodies** are prominent, dark-staining, coarse cytoplasmic granules found in neutrophils, lymphocytes, and monocytes. They are the hallmark hematological finding in **Mucopolysaccharidosis (MPS)**, such as Hurler and Hunter syndromes [1]. 1. **Why Mucopolysaccharidosis is correct:** In MPS, there is a genetic deficiency of lysosomal enzymes required to degrade glycosaminoglycans (GAGs) [2]. This leads to the accumulation of partially degraded GAGs within lysosomes, which manifest morphologically as Alder-Reilly bodies [1]. Unlike toxic granulation (seen in infections), these granules are present in all leukocytes and are not associated with an increased band count or clinical signs of infection. 2. **Why other options are incorrect:** * **Langerhans cell histiocytosis:** Characterized by Birbeck granules (tennis-racket shaped) on electron microscopy, not coarse leukocyte granules. * **Alport syndrome:** A genetic disorder of Type IV collagen affecting the basement membrane (kidneys, ears, eyes). It is associated with **May-Hegglin anomaly** (Döhle-like bodies and giant platelets), not Alder-Reilly bodies. * **Chediak-Higashi syndrome:** Characterized by **giant lysosomal granules** in leukocytes due to a defect in vesicle trafficking (LYST gene), leading to albinism and recurrent infections. **High-Yield Clinical Pearls for NEET-PG:** * **Staining:** Alder-Reilly bodies stain positive with **Metachromatic stains** (like Toluidine blue). * **Differentiating Feature:** Unlike toxic granules, Alder-Reilly bodies are permanent and present in a non-toxic clinical setting. * **Associated Conditions:** Most commonly seen in Hurler Syndrome (MPS I) and Hunter Syndrome (MPS II) [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 163-164. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Disorders Involving Inflammatory And Haemopoietic Cells, pp. 654-655.

Question 415: What is the value of the color index in microcytic hypochromic anemia associated with pregnancy?

A. One
B. Less than one (Correct Answer)
C. More than one
D. Three

Explanation: **Explanation:** The **Color Index (CI)** is an older hematological parameter that represents the relative hemoglobin content of a single red blood cell compared to a normal cell. It is calculated using the formula: $\text{Color Index} = \frac{ ext{Hemoglobin % of normal}}{\text{RBC count % of normal}}$ In modern practice, this has been largely replaced by **MCH (Mean Corpuscular Hemoglobin)**. **Why "Less than one" is correct:** Microcytic hypochromic anemia (most commonly **Iron Deficiency Anemia**) is the most frequent anemia seen in pregnancy due to increased fetal demand and expanded maternal plasma volume. In this condition, the reduction in hemoglobin is disproportionately greater than the reduction in the red cell count [1]. Since the numerator (Hb%) decreases more than the denominator (RBC%), the resulting value is **less than 1.0** (typically 0.6 to 0.8). **Analysis of Incorrect Options:** * **Option A (One):** A CI of 1.0 is seen in **Normocytic Normochromic anemia**, where Hb and RBC count decrease proportionately (e.g., acute blood loss or anemia of chronic disease). * **Option C (More than one):** A CI > 1.0 is characteristic of **Macrocytic anemias** (e.g., Megaloblastic anemia due to B12/Folate deficiency), where the large size of the RBC allows for a higher absolute hemoglobin content per cell. * **Option D (Three):** This is a physiologically impossible value for Color Index. **NEET-PG High-Yield Pearls:** 1. **Normal CI Range:** 0.85 to 1.15. 2. **Pregnancy Anemia:** Defined by the WHO as Hb **<11 g/dL**. 3. **MCHC vs. CI:** While CI measures hemoglobin per cell (like MCH), **MCHC** is the most specific indicator of hypochromia. 4. **Most common cause:** Iron deficiency is the #1 cause of microcytic hypochromic anemia in pregnancy worldwide [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 590-591.

Question 416: Which of the following is the test for β-thalassemia trait?

A. HbA2 (Correct Answer)
B. HbF
C. Fragility test
D. Coomb's test

Explanation: **Beta-thalassemia trait (minor)** is characterized by a reduced production of $\beta$-globin chains [2]. To compensate for this deficiency, the body increases the synthesis of alternative hemoglobin forms. 1. **Why HbA2 is the correct answer:** In $\beta$-thalassemia trait, the lack of $\beta$-chains leads to an excess of $\alpha$-chains. These $\alpha$-chains combine with $\delta$-chains to form **HbA2 ($\alpha_2\delta_2$)**. An elevated HbA2 level (typically **>3.5%**) is the diagnostic hallmark and the most reliable screening test for $\beta$-thalassemia trait. High-performance liquid chromatography (HPLC) or electrophoresis is used for quantification. 2. **Why other options are incorrect:** * **HbF ($\alpha_2\gamma_2$):** While HbF may be slightly elevated in the trait (1–5%), it is significantly elevated in **$\beta$-thalassemia major**. It is not as specific or consistent as HbA2 for diagnosing the trait [1]. * **Fragility Test (Osmotic Fragility):** This test is used to diagnose **Hereditary Spherocytosis** (where cells are more fragile). In thalassemia, cells are actually *less* fragile (increased resistance) due to their hypochromic, microcytic nature, but this is a non-specific finding. * **Coombs’ Test:** This is used to detect antibodies in **Immune Hemolytic Anemias**. Thalassemia is a genetic hemoglobinopathy, not an immune-mediated process. **High-Yield Clinical Pearls for NEET-PG:** * **Mentzer Index:** (MCV/RBC count) $<13$ suggests Thalassemia trait; $>13$ suggests Iron Deficiency Anemia (IDA). * **Peripheral Smear:** Shows microcytic hypochromic anemia with **target cells** and basophilic stippling. * **NEET-PG Fact:** If a patient has both IDA and $\beta$-thalassemia trait, the HbA2 level may be falsely normal. Always correct iron deficiency before testing for HbA2. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 600-601. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, p. 650.

Question 417: Burkitt's Lymphoma commonly affects which anatomical site?

A. Jaw (Correct Answer)
B. Stomach
C. Spleen
D. Kidneys

Explanation: **Explanation:** Burkitt’s Lymphoma (BL) is a highly aggressive B-cell non-Hodgkin lymphoma characterized by the translocation of the **c-MYC gene** (typically t(8;14)). The anatomical presentation of BL varies significantly based on its clinical variant [1]: 1. **Endemic (African) Variant:** This is the classic form strongly associated with **Epstein-Barr Virus (EBV)**. It characteristically presents as a rapidly growing mass in the **mandible or maxilla (jaw)** in children [1]. This makes **Option A** the most common site associated with the classic description of the disease. 2. **Sporadic (Non-African) Variant:** This form is less associated with EBV and typically presents as an **abdominal mass**, most commonly involving the **ileocecal region** [1]. **Analysis of Incorrect Options:** * **B. Stomach:** While the sporadic form involves the abdomen, it primarily affects the distal ileum and cecum rather than the stomach (which is more common for MALTomas). * **C. Spleen:** Splenomegaly can occur, but the spleen is rarely the primary or defining site of presentation for BL. * **D. Kidneys:** Renal involvement can occur as part of systemic spread or in the sporadic form, but it is not the "classic" anatomical site used to identify the disease in exams [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Morphology:** Characterized by a **"Starry Sky" appearance** (tingible body macrophages representing the "stars" against a background of dark neoplastic B-cells). * **Immunophenotype:** Positive for CD19, CD20, CD10, and **BCL-6**; notably **BCL-2 negative**. * **Proliferation:** It has one of the highest proliferation rates (Ki-67 index often approaching **100%**). * **Genetics:** t(8;14) is most common; variants include t(2;8) and t(8;22). **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. 605-606.

Question 418: In which condition is Thrombin time raised?

A. Afibrinogenemia (Correct Answer)
B. Hemophilia
C. Factor XII deficiency
D. von Willebrand's disease

Explanation: **Explanation:** **Thrombin Time (TT)** measures the time it takes for fibrinogen to convert into fibrin after the addition of exogenous thrombin to plasma [2]. It specifically evaluates the final step of the coagulation cascade. 1. **Why Afibrinogenemia is correct:** Since TT directly measures the conversion of fibrinogen to fibrin, any quantitative deficiency (**Afibrinogenemia/Hypofibrinogenemia**) or qualitative defect (**Dysfibrinogenemia**) of fibrinogen will result in a prolonged (raised) Thrombin Time [2]. It is also prolonged by substances that interfere with thrombin, such as heparin or FDPs (Fibrin Degradation Products) [1]. 2. **Why other options are incorrect:** * **Hemophilia (Factor VIII deficiency):** Affects the intrinsic pathway. It prolongs **aPTT**, but PT and TT remain normal. * **Factor XII deficiency:** Affects the start of the intrinsic pathway. It causes a markedly prolonged **aPTT** in vitro but typically no clinical bleeding. TT is normal. * **von Willebrand's disease:** Primarily a disorder of platelet adhesion. It may prolong **aPTT** (due to low Factor VIII levels), but TT is always normal as fibrinogen conversion is unaffected. **High-Yield Pearls for NEET-PG:** * **Reptilase Time:** Used to differentiate heparin contamination from fibrinogen deficiency. Reptilase time is **prolonged** in afibrinogenemia but **normal** in the presence of heparin (as reptilase is not inhibited by antithrombin III). * **Most common cause of prolonged TT:** Heparin therapy. * **Mixing Studies:** If TT is prolonged, a 1:1 mix with normal plasma that fails to correct the time suggests the presence of an inhibitor (like heparin or hirudin). **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 625-626. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, p. 130.

Question 419: Auer rods are seen in which of the following cells?

A. Lymphoblast
B. Myeloblast (Correct Answer)
C. Erythroblast
D. Megakaryoblast

Explanation: **Explanation:** **Auer rods** are pathognomonic morphological features of the **myeloid lineage** [1]. They are elongated, needle-like, pink or red-staining cytoplasmic inclusions formed by the fusion and crystallization of primary (azurophilic) granules [2]. 1. **Why Myeloblasts are correct:** Auer rods contain peroxidase, lysosomal enzymes, and crystalloid mucopolysaccharides. Since these granules are specific to the granulocytic series, Auer rods are found in **myeloblasts** and occasionally in promyelocytes (especially in APL) [1], [2]. Their presence definitively excludes a diagnosis of Acute Lymphoblastic Leukemia (ALL). 2. **Why other options are incorrect:** * **Lymphoblasts:** These cells belong to the lymphoid lineage, which lacks azurophilic granules and peroxidase; therefore, they never contain Auer rods [2]. * **Erythroblasts & Megakaryoblasts:** While these are part of the myeloid family (non-lymphoid), they do not typically form these specific crystalline inclusions. Auer rods are markers of **granulocytic differentiation** [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Acute Promyelocytic Leukemia (AML-M3):** Characterized by "faggot cells," which contain bundles or clusters of numerous Auer rods [2]. * **Staining:** Auer rods are strongly **Myeloperoxidase (MPO)** positive and **Sudan Black B** positive. * **Diagnostic Significance:** If you see an Auer rod, the diagnosis is **AML** (Acute Myeloid Leukemia) until proven otherwise [1]. They are never seen in Chronic Myeloid Leukemia (CML) unless it has entered a "myeloid blast crisis." **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. 620. [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. 621-622.

Question 420: All of the following stem cell populations are found within the bone marrow, except?

A. Endothelial Progenitor cells
B. Myoblast Progenitor cells (Correct Answer)
C. Mesenchymal stem cells
D. Hematopoietic stem cells

Explanation: **Explanation:** The bone marrow is a complex microenvironment (niche) that serves as the primary site for hematopoiesis and houses various multipotent stem cell populations. **Why Myoblast Progenitor cells are the correct answer:** Myoblast progenitor cells (satellite cells) are the precursors to skeletal muscle cells. They are found located between the sarcolemma and the endomysium of **muscle fibers**, not in the bone marrow. While they are stem cells, their lineage is restricted to myogenic differentiation within muscular tissue. **Analysis of incorrect options:** * **Hematopoietic Stem Cells (HSCs):** These are the most well-known residents of the bone marrow [1]. They are multipotent cells responsible for the constant renewal of all blood lineages (erythroid, myeloid, and lymphoid) [3]. * **Mesenchymal Stem Cells (MSCs):** Also known as Marrow Stromal Cells, these are multipotent cells that can differentiate into "stromal" lineages, including **osteoblasts** (bone), **chondrocytes** (cartilage), and **adipocytes** (fat). They play a crucial role in maintaining the HSC niche [2]. * **Endothelial Progenitor Cells (EPCs):** These cells reside in the bone marrow and can be mobilized into the peripheral blood to assist in neoangiogenesis (formation of new blood vessels) and vascular repair. **NEET-PG High-Yield Pearls:** * **HSC Marker:** CD34+ is the classic surface marker used to identify and isolate hematopoietic stem cells for transplants. * **Niche Regulation:** The "Osteoblastic Niche" (endosteal) is associated with HSC quiescence, while the "Vascular Niche" (sinusoids) is associated with HSC proliferation and differentiation. * **Plasticity:** While MSCs are primarily found in bone marrow, they can also be isolated from adipose tissue and umbilical cord blood. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 588-589. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, p. 1182. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 104-105.

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Plasma Cell Disorders

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Bleeding Disorders

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Thrombotic Disorders

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