Hematopathology Practice Questions

Q: Birbeck’s granules in the cytoplasm are seen in:

Langerhans cells. **Explanation:** **Langerhans cells (Option A)** are specialized dendritic cells found primarily in the skin (stratum spinosum) and other squamous epithelia [1]. The pathognomonic ultrastructural feature of these cells is the **Birbeck granule** [1]. Under electron microscopy, these are rod-shaped, pentalaminar cytoplasmic organelles with a central striated line and a bulbous end, giving them a characteristic **"tennis racket" appearance** [1]. They contain the protein **langerin (CD207)**, which is involved in the endocytosis and degradation of viruses [1]. **Why other options are incorrect:** * **Mast cells (Option B):** These are characterized by dense, membrane-bound cytoplasmic granules containing histamine, heparin, and tryptase. They do not contain Birbeck granules. * **Myelocytes (Option C):** These are precursors in the granulocytic series. They contain primary (azurophilic) and secondary (specific) granules, but lack Birbeck granules. * **Thrombocytes (Option D):** Platelets contain alpha-granules (fibrinogen, vWF) and dense granules (ADP, ATP, serotonin, calcium), but no Birbeck granules. **High-Yield Clinical Pearls for NEET-PG:** * **Langerhans Cell Histiocytosis (LCH):** A group of disorders (e.g., Letterer-Siwe disease, Hand-Schüller-Christian disease) characterized by the proliferation of these cells [1]. * **Immunohistochemistry (IHC) Markers:** LCH cells are characteristically positive for **S-100**, **CD1a**, and **CD207 (Langerin)** [1]. * **Radiology:** Often presents with "punched-out" lytic bone lesions, especially in the skull. **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. 629-630.

Q: Which of the following statements regarding Fanconi anemia is incorrect?

It is an autosomal dominant disorder.. **Explanation** **1. Why Option A is the Correct (Incorrect Statement):** Fanconi Anemia (FA) is primarily an **autosomal recessive** disorder. While rare cases of X-linked inheritance (FANCB gene) exist, it is **not** an autosomal dominant condition. This is a common trap in NEET-PG; most inherited bone marrow failure syndromes are recessive. **2. Analysis of Other Options:** * **Option B & C:** FA is the most common cause of **inherited aplastic anemia** [1]. The defect leads to progressive bone marrow failure, which manifests as **pancytopenia** (reduction in RBCs, WBCs, and platelets). Bone marrow examination typically reveals hypocellularity with increased fat replacement [2]. * **Option D:** The fundamental pathogenesis involves mutations in the **FANC gene family**, which are responsible for the **DNA interstrand cross-link repair** pathway. This defect leads to genomic instability and hypersensitivity to DNA-damaging agents. **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Physical Findings:** Look for "Thumb and Radius" defects (absent/hypoplastic), short stature, microcephaly, and **Café-au-lait spots**. * **Diagnostic Test:** The gold standard is the **Chromosomal Breakage Analysis** using Clastogenic agents like **Diepoxybutane (DEB)** or Mitomycin C. * **Malignancy Risk:** Patients have a significantly high risk of developing **AML** (Acute Myeloid Leukemia) and squamous cell carcinomas (head, neck, and anogenital). * **Treatment:** Hematopoietic stem cell transplant (HSCT) is the definitive treatment for hematologic manifestations. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 595-596. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 662-663.

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].

Question 1

Which of the following is NOT a minor diagnostic criterion for multiple myeloma?

Accepted Answer

Plasmacytoma on biopsy

Answer

Lytic bone lesions

Answer

Plasmacytosis greater than 20%

Answer

Monoclonal globulin spike on serum electrophoresis of > 2.5 g/dl for IgG, >1.5 g/dl for IgA

Question 2

Both APTT and PT are prolonged in which of the following conditions?

Accepted Answer

Factor II deficiency

Answer

Factor XIII deficiency

Answer

Heparin administration

Answer

Thrombocytopenia

Question 3

Which is the most common lymphoma in adults?

Accepted Answer

Diffuse large B-cell lymphoma (DLBCL)

Answer

Adult T-cell leukemia/lymphoma (ATLL)

Answer

Hodgkin lymphoma

Answer

Follicular lymphoma

Question 4

Birbeck’s granules in the cytoplasm are seen in:

Accepted Answer

Langerhans cells

Answer

Mast cells

Answer

Myelocytes

Answer

Thrombocytes

Question 5

Which of the following statements regarding Fanconi anemia is incorrect?

Accepted Answer

It is an autosomal dominant disorder.

Answer

Bone marrow examination typically shows pancytopenia.

Answer

It commonly presents as aplastic anemia.

Answer

It results from a defect in DNA repair.

Question 6

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 7

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 8

What causes hemolysis in G6-PD deficiency?

Accepted Answer

Oxidative stress

Answer

Hemoglobin defect

Answer

Membrane defect

Answer

Vitamin B12 deficiency

Question 9

In which of the following conditions are Auer rods seen?

Accepted Answer

Granulocytic sarcoma

Answer

Myelodysplastic syndrome

Answer

Multiple myeloma

Answer

Leukemia cutis

Question 10

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

Accepted Answer

Hemochromatosis

Answer

Hemosiderosis

Answer

Cholelithiasis

Answer

None of the above

Hematopathology — MCQs

Hematopathology — MCQs

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