Hematopathology Practice Questions

Q: Which stage of erythroid maturation is characterized by the presence of the 'Die' nucleus?

M3 AML. **Explanation:** The term **'Die' nucleus** (or 'dice' nucleus) refers to the characteristic nuclear morphology seen in **Acute Promyelocytic Leukemia (APL)**, classified as **M3 AML** in the French-American-British (FAB) system [1]. **1. Why M3 AML is Correct:** In APL, the malignant cells are promyelocytes. These cells often exhibit a **bilobed, reniform (kidney-shaped), or "butterfly" nucleus** that resembles the faces of a die. This is a high-yield morphological marker alongside the presence of **Auer rods**, which are often found in bundles called **Faggot cells**. The underlying molecular pathology is the **t(15;17)** translocation, involving the PML-RARA fusion gene [1]. **2. Why Other Options are Incorrect:** * **M1 AML (Minimal Maturation):** Characterized by myeloblasts with negligible maturation and rare Auer rods. The nuclei are typically round to oval, not "die-shaped." * **M2 AML (With Maturation):** Shows significant maturation beyond the blast stage. While Auer rods are common, the classic "die" nucleus is not a defining feature [1]. * **M4 AML (Acute Myelomonocytic Leukemia):** Characterized by both myeloid and monocytic lineages. Monocytic cells have folded or indented nuclei, but they lack the specific "die" appearance of M3. **3. High-Yield Clinical Pearls for NEET-PG:** * **Emergency:** M3 AML is a medical emergency due to the high risk of **DIC (Disseminated Intravascular Coagulation)** triggered by the release of procoagulants from granules. * **Treatment:** The mainstay of treatment is **ATRA (All-trans retinoic acid)** and Arsenic Trioxide, which force the differentiation of promyelocytes. * **Cytogenetics:** Always associate M3 with **t(15;17)** [1].

Q: Gandy-Gandy bodies are typically seen in chronic venous congestion of which of the following organs?

Spleen. **Explanation:** **Gandy-Gamna bodies** (also known as Gamna-Gandy bodies or Siderofibrotic nodules) are a classic histopathological finding in the **Spleen**. 1. **Mechanism (Why Spleen is correct):** In conditions causing chronic venous congestion of the spleen (most commonly **Portal Hypertension**), there is increased pressure leading to focal hemorrhages within the splenic parenchyma. As the blood breaks down, deposits of **hemosiderin** (iron) and **calcium** form on the fibrous connective tissue and elastic fibers [1]. Microscopically, these appear as yellow-brown or rust-colored nodules consisting of fibrous tissue, iron, and calcium salts. 2. **Analysis of Incorrect Options:** * **Lung:** Chronic venous congestion of the lung (often due to left heart failure) leads to the formation of **Heart Failure Cells** (hemosiderin-laden macrophages in the alveoli), not Gandy-Gamna bodies. * **Liver:** Chronic venous congestion here results in the **"Nutmeg Liver"** appearance due to centrilobular necrosis and congestion, but it does not typically form siderofibrotic nodules. * **Kidney:** Congestion in the kidney leads to dusky, enlarged organs but lacks the specific fibro-calcific and iron-laden reaction seen in the spleen. **High-Yield Clinical Pearls for NEET-PG:** * **Staining:** Gandy-Gamna bodies stain positive with **Prussian Blue** (for iron) and **Von Kossa** (for calcium). * **Common Associations:** Portal hypertension (due to Cirrhosis), Sickle Cell Anemia, and Splenic Lymphoma. * **Radiology:** On MRI, they appear as multiple low-signal intensity foci (due to the paramagnetic effect of iron) on T2-weighted sequences, often referred to as the "tobacco-fleck" appearance. **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. 630-634.

Q: All are important laboratory features of hereditary spherocytosis, EXCEPT:

Reduced MCHC. In Hereditary Spherocytosis (HS), the primary defect lies in the red cell membrane proteins (most commonly **Ankyrin**, followed by Spectrin) [2], leading to a loss of membrane surface area. **Explanation of the Correct Answer:** * **Option A (Reduced MCHC):** This is the correct answer because it is **false**. In HS, the loss of membrane surface area relative to the volume results in the formation of spherical cells (spherocytes) [1]. These cells are dehydrated, leading to a relative increase in hemoglobin concentration within the cell. Therefore, **MCHC is typically increased (>36 g/dL)**, not reduced [1]. An elevated MCHC is a classic hallmark of HS. **Explanation of Incorrect Options:** * **Option B (Normocytic anemia):** While spherocytes appear small, their MCV is usually within the normal range or slightly low (80-100 fL) because the reticulocytosis (immature, larger RBCs) compensates for the smaller spherocytes. * **Option C (Positive Pink Test):** The "Pink Test" is a simplified version of the Glycerol Lysis Test. It measures the rate of hemolysis; spherocytes lyse more rapidly than normal cells in an acidic glycerol solution, yielding a positive result. * **Option D (Normal WBC count):** HS is a primary disorder of the RBC membrane. Unless there is a secondary infection or an acute crisis, the white blood cell and platelet counts remain normal. **High-Yield Clinical Pearls for NEET-PG:** 1. **Gold Standard Test:** Eosin-5-maleimide (EMA) binding test (Flow cytometry). 2. **Classic Triad:** Anemia, Jaundice, and Splenomegaly. 3. **Peripheral Smear:** Spherocytes (lack central pallor) and Polychromasia (due to reticulocytosis). 4. **Complications:** Pigment gallstones (calcium bilirubinate) and Aplastic crisis (associated with Parvovirus B19). 5. **Treatment of Choice:** Splenectomy (usually deferred until after age 6 to reduce sepsis risk) [2].

Q: Which congenital syndromes are associated with lymphoproliferative malignancy?

Chediak Higashi syndrome. Explanation: The correct answer is Chediak-Higashi Syndrome (CHS). 1. Why Chediak-Higashi Syndrome is correct: CHS is an autosomal recessive disorder caused by a mutation in the LYST gene, leading to defective vesicle trafficking and the formation of giant lysosomal granules. The primary immunological defect involves impaired Natural Killer (NK) cell function and cytotoxic T-cell activity. A hallmark of CHS is the "Accelerated Phase," a hemophagocytic lymphohistiocytosis (HLH)-like syndrome characterized by a non-neoplastic but aggressive lymphoproliferative infiltration of organs (liver, spleen, lymph nodes), which often progresses to or mimics high-grade lymphoma. 2. Why the other options are incorrect: * Bloom Syndrome: While associated with a high risk of various cancers due to DNA helicase deficiency (sister chromatid exchanges), it is more classically linked to leukemias (AML/ALL) and solid tumors rather than primary lymphoproliferative syndromes. * Fanconi’s Anemia: This is a DNA repair defect primarily associated with Acute Myeloid Leukemia (AML) and squamous cell carcinomas. It is not typically categorized under lymphoproliferative malignancies. * Turner Syndrome (45, XO): This chromosomal anomaly is associated with an increased risk of gonadoblastoma (if Y chromatin is present) and germ cell tumors, but not lymphoproliferative disorders. 3. High-Yield Clinical Pearls for NEET-PG: * Chediak-Higashi Triad: Partial oculocutaneous albinism, recurrent pyogenic infections (Staph/Strep), and peripheral neuropathy. * Peripheral Smear: Look for pathognomonic giant azurophilic granules in neutrophils and precursors. * Other Immunodeficiencies with Lymphoma risk: Wiskott-Aldrich Syndrome, Ataxia-Telangiectasia, and Common Variable Immunodeficiency (CVID) are also high-yield associations for lymphoproliferative malignancy.

Question 1

Osmotic fragility is increased in which of the following conditions?

Accepted Answer

Hereditary spherocytosis

Answer

Sickle cell anaemia

Answer

Thalassemia

Answer

Chronic lead poisoning

Question 2

Which stage of erythroid maturation is characterized by the presence of the 'Die' nucleus?

Accepted Answer

M3 AML

Answer

M1 AML

Answer

M2 AML

Answer

M4 AML

Question 3

What causes hemolysis in G6-PD deficiency?

Accepted Answer

Oxidative stress

Answer

Hemoglobin defect

Answer

Membrane defect

Answer

Vitamin B12 deficiency

Question 4

In which of the following conditions are Auer rods seen?

Accepted Answer

Granulocytic sarcoma

Answer

Myelodysplastic syndrome

Answer

Multiple myeloma

Answer

Leukemia cutis

Question 5

Which of the following findings is NOT typically seen in hemolytic anemia?

Accepted Answer

Hemochromatosis

Answer

Hemosiderosis

Answer

Cholelithiasis

Answer

None of the above

Question 6

Gandy-Gandy bodies are typically seen in chronic venous congestion of which of the following organs?

Accepted Answer

Spleen

Answer

Lung

Answer

Kidney

Answer

Liver

Question 7

All are important laboratory features of hereditary spherocytosis, EXCEPT:

Accepted Answer

Reduced MCHC

Answer

Normocytic anemia

Answer

Positive pink test

Answer

Normal WBC count

Question 8

Which of the following is true about Burkitt's lymphoma?

Accepted Answer

Shows a starry sky pattern on histology

Answer

Associated with t(14;18)

Answer

Expresses BCL-2

Answer

Slowly progressing

Question 9

Which congenital syndromes are associated with lymphoproliferative malignancy?

Accepted Answer

Chediak Higashi syndrome

Answer

Bloom syndrome

Answer

Fanconi's anemia

Answer

Turner syndrome

Question 10

The typical bone marrow finding in Idiopathic Thrombocytopenic Purpura (ITP) is:

Accepted Answer

Increased megakaryocytes

Answer

Absent megakaryocytes

Answer

Foam cells

Answer

Fragmented megakaryocytes

Hematopathology — MCQs

Hematopathology — MCQs

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