Hematopathology Practice Questions

Q: Megaloblastic anemia may be caused by all of the following except?

Copper deficiency. Megaloblastic anemia is a subset of macrocytic anemia characterized by impaired DNA synthesis, leading to a "nuclear-cytoplasmic asynchrony" where the nucleus matures slower than the cytoplasm. **Why Copper Deficiency is the Correct Answer:** Copper deficiency typically causes **Microcytic or Normocytic anemia**, not megaloblastic anemia. It leads to anemia primarily by interfering with iron metabolism (via ceruloplasmin/ferroxidase activity) and can also cause **sideroblastic changes** and neutropenia. While it may mimic myelodysplastic syndrome, it does not classically present with megaloblastic morphology. **Analysis of Other Options:** * **Liver Disease:** Chronic liver disease is a common cause of non-megaloblastic macrocytosis, but in advanced stages, it can lead to megaloblastic changes due to altered lipid metabolism in red cell membranes or associated folate deficiency. * **Thiamine Deficiency:** Specifically, **Thiamine-Responsive Megaloblastic Anemia (TRMA)** or Rogers Syndrome is a rare genetic disorder characterized by megaloblastic anemia, diabetes mellitus, and sensorineural deafness. * **Orotic Aciduria:** This is an autosomal recessive disorder of pyrimidine synthesis. The deficiency of UMP synthase leads to a failure of DNA synthesis, resulting in megaloblastic anemia that is **refractory** to Vitamin B12 and Folate supplementation. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Vitamin B12 and Folate deficiency [1]. * **Drug-induced:** Methotrexate, Phenytoin, and Hydroxyurea are frequent culprits. * **Distinguishing feature:** Look for **hypersegmented neutrophils** (>5 lobes) on a peripheral smear [1]. * **Orotic Aciduria vs. OTC Deficiency:** Both have high orotic acid, but only Orotic Aciduria presents with megaloblastic anemia and *normal* ammonia levels.

Q: Which coagulation test is used to assess the effects of heparin therapy or toxicity?

Heparin toxicity. **Explanation:** The correct answer is **Heparin toxicity**. The **Activated Partial Thromboplastin Time (aPTT)** is the primary laboratory test used to monitor the anticoagulant effect of Unfractionated Heparin (UFH). Heparin acts by binding to Antithrombin III, which then inactivates Thrombin (Factor IIa) and Factor Xa [1]. Since these factors are integral to the intrinsic and common pathways, heparin significantly prolongs the aPTT [1]. In cases of heparin toxicity (overdose), the aPTT will be markedly elevated, guiding the administration of the antidote, Protamine Sulfate. **Analysis of Incorrect Options:** * **Option A (Warfarin toxicity):** Warfarin inhibits Vitamin K epoxide reductase, affecting Factors II, VII, IX, and X [1]. Its effect is monitored using **Prothrombin Time (PT)** and **INR**, not aPTT. * **Option B (Low Molecular Weight Heparin):** LMWH (e.g., Enoxaparin) has a higher ratio of anti-Xa to anti-IIa activity. It does not significantly prolong aPTT. Monitoring, if required (e.g., in renal failure or pregnancy), is done via the **Anti-Xa assay**. * **Option D (Extrinsic pathway defect):** The extrinsic pathway (Factor VII) is assessed using **Prothrombin Time (PT)** [1]. aPTT assesses the intrinsic (XII, XI, IX, VIII) and common pathways. **High-Yield Clinical Pearls for NEET-PG:** * **Mixing Studies:** If aPTT is prolonged, a mixing study is done. If it corrects, it indicates a **factor deficiency** (e.g., Hemophilia); if it doesn't correct, it indicates an **inhibitor** (e.g., Lupus anticoagulant). * **Antidote:** The specific neutralizer for Heparin is **Protamine Sulfate**. * **Therapeutic Range:** For UFH, the goal is usually an aPTT of 1.5 to 2.5 times the control value. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 582-626.

Q: Which of the following statements are true regarding Burkitt's lymphoma?

It can present as an abdominal mass.. **Explanation:** Burkitt’s Lymphoma (BL) is a highly aggressive B-cell non-Hodgkin lymphoma characterized by the translocation of the **MYC gene**. **Why Option C is Correct:** Burkitt’s lymphoma is categorized into three clinical variants: Endemic (African), Sporadic (Non-African), and Immunodeficiency-associated. The **Sporadic form** most commonly involves the **ileocecal region and peritoneum**, frequently presenting as a rapidly enlarging **abdominal mass**, pain, or bowel obstruction [1]. **Analysis of Incorrect Options:** * **Option A:** While BL is indeed a B-cell lymphoma, the question asks for the "most true" or specific clinical characteristic in many exam patterns. However, in a "multiple true" context, A is technically correct. In the context of this specific single-choice question, the clinical presentation (Option C) is the classic examiner focus. * **Option B:** BL is associated with **t(8;14)** in 80% of cases, involving the *c-MYC* gene on chromosome 8 and the *IgH* gene on chromosome 14. Other variants include t(2;8) and t(8;22). t(6;14) is not associated with BL. * **Option D:** BL is a systemic disease with a very high proliferation rate (nearly 100% Ki-67 index). Therefore, it is primarily treated with **intensive chemotherapy** (e.g., CODOX-M/IVAC) [1]. Radiotherapy is rarely used as a primary modality. **High-Yield Clinical Pearls for NEET-PG:** * **Morphology:** "Starry-sky" appearance [1] (tingible body macrophages against a sea of cohesive B-cells). * **Genetics:** Overexpression of **c-MYC** (a transcription factor). * **Endemic Form:** Strongly associated with **EBV**; typically presents as a **jaw mass** [1]. * **Cytology:** Medium-sized cells with basophilic cytoplasm and prominent lipid vacuoles. **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.

Q: Heinz bodies are composed of?

Denatured haemoglobin. **Explanation:** **Heinz bodies** are inclusions within red blood cells composed of **denatured (precipitated) hemoglobin** [1]. 1. **Why Option D is Correct:** Heinz bodies form when hemoglobin undergoes oxidative damage. In conditions like **G6PD deficiency**, the lack of NADPH prevents the reduction of glutathione. Without reduced glutathione, reactive oxygen species (ROS) attack the globin chains of hemoglobin, causing them to denature and form insoluble precipitates [1]. These precipitates attach to the RBC membrane, damaging it and leading to splenic removal, which results in "Bite cells" [1]. 2. **Why Other Options are Incorrect:** * **A. DNA:** Inclusions of nuclear DNA remnants are called **Howell-Jolly bodies**, typically seen in asplenia or megaloblastic anemia. * **B. RNA:** Ribosomal RNA precipitates are known as **Basophilic stippling**, seen in lead poisoning, thalassemias, and sideroblastic anemia. * **C. Iron:** Inclusions of non-heme iron are called **Pappenheimer bodies** (seen on Wright stain) or **Siderotic granules** (seen on Prussian blue stain), characteristic of sideroblastic anemia. **High-Yield Clinical Pearls for NEET-PG:** * **Staining:** Heinz bodies are **NOT visible on routine Leishman or Romanowsky stains**. They require **Supravital stains** (e.g., Crystal Violet, Brilliant Cresyl Blue, or Methylene Blue). * **Morphology:** They appear as dark, round granules attached to the inner RBC membrane. * **Clinical Association:** Most commonly associated with **G6PD deficiency**, but also seen in unstable hemoglobin variants (e.g., Hb Cologne) and chronic drug-induced oxidative stress [1]. * **Sequence of events:** Heinz bodies → Splenic macrophages "bite" them out → **Bite cells (Degmacytes)** [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 642-643.

Q: Which of the following statements is not true regarding hemolytic uremic syndrome?

Direct Coombs test is positive.. **Explanation:** Hemolytic Uremic Syndrome (HUS) is a classic triad of **Microangiopathic Hemolytic Anemia (MAHA)**, **Thrombocytopenia**, and **Acute Kidney Injury (AKI)**. **Why Option D is the correct answer (False statement):** The hemolysis in HUS is **non-immune** in nature. It is caused by mechanical destruction of RBCs as they pass through fibrin-platelet thrombi in small vessels (fragmentation hemolysis). Therefore, the **Direct Coombs Test (DAT) is characteristically negative**. A positive Coombs test would instead suggest an autoimmune hemolytic anemia (AIHA). **Analysis of Incorrect Options (True statements):** * **Option A:** HUS is a prototype of MAHA. The primary pathology involves endothelial injury leading to microvascular thrombosis. * **Option B:** Consumption of platelets within these microthrombi leads to **thrombocytopenia**. The mechanical shearing of RBCs results in fragmented cells known as **schistocytes** (helmet cells) on the peripheral smear. * **Option C:** The renal microvasculature is the primary target, leading to decreased GFR, hematuria, proteinuria, and often severe **renal insufficiency** requiring dialysis. **Clinical Pearls for NEET-PG:** * **Most common cause:** Shiga toxin-producing *E. coli* (STEC), specifically serotype **O157:H7**. * **Prodrome:** Usually begins with bloody diarrhea (D+ HUS). * **Atypical HUS (D- HUS):** Associated with genetic mutations in the alternative complement pathway (e.g., Factor H deficiency). * **Management:** Primarily supportive (fluid/electrolyte balance, dialysis). **Antibiotics and anti-motility agents are contraindicated** as they may increase toxin release and worsen the condition.

Question 1

A patient's prothrombin time (PT) is 26 seconds, the control PT is 13 seconds, and the sensitivity index is 1.41. What will be the INR of this patient?

Accepted Answer

None

Answer

26/13

Answer

(26/13) x 1.41

Answer

Both

Question 2

Megaloblastic anemia may be caused by all of the following except?

Accepted Answer

Copper deficiency

Answer

Liver disease

Answer

Thiamine deficiency

Answer

Orotic aciduria

Question 3

Cryoprecipitate contains which of the following components?

Accepted Answer

Factor IX

Answer

Factor VIII

Answer

Fibrinogen

Answer

von Willebrand factor (vWF)

Question 4

A normal Mean Corpuscular Volume (MCV) would be expected in which of the following conditions?

Accepted Answer

Two days post-acute bleed

Answer

Resection of the terminal ileum

Answer

Beta-thalassemia minor

Answer

Chronic bleeding duodenal ulcer

Question 5

Which coagulation test is used to assess the effects of heparin therapy or toxicity?

Accepted Answer

Heparin toxicity

Answer

Warfarin toxicity

Answer

Low molecular weight heparin

Answer

Extrinsic coagulation pathway defect

Question 6

Which of the following statements are true regarding Burkitt's lymphoma?

Accepted Answer

It can present as an abdominal mass.

Answer

It is a B cell lymphoma.

Answer

It is associated with the 6;14 translocation.

Answer

Radiotherapy is used in its treatment.

Question 7

Leukostasis is common in which of the following hematological conditions?

Accepted Answer

AML

Answer

ALL

Answer

CML

Answer

CLL

Question 8

Heinz bodies are composed of?

Accepted Answer

Denatured haemoglobin

Answer

DNA

Answer

RNA

Answer

Iron

Question 9

Which of the following statements is not true regarding hemolytic uremic syndrome?

Accepted Answer

Direct Coombs test is positive.

Answer

It is a microangiopathic hemolytic anemia.

Answer

Thrombocytopenia and schistocytes are seen in the peripheral blood smear.

Answer

Renal insufficiency is a complication.

Question 10

Post-transplant lymphoma occurs due to proliferation of which of the following cells?

Accepted Answer

B cell

Answer

T cell

Answer

NK cell

Answer

Monocyte

Hematopathology — MCQs

Hematopathology — MCQs

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