Hematopathology Practice Questions

Q: Macrocytosis is seen in all of the following disorders, except?

Thalassemia major. **Explanation:** The correct answer is **Thalassemia major** because it is a disorder characterized by **microcytic hypochromic anemia**, not macrocytosis. [1] **1. Why Thalassemia Major is the correct answer:** In Thalassemia, there is a genetic defect in the synthesis of globin chains (alpha or beta). This leads to deficient hemoglobin production. To compensate for the lack of hemoglobin, the red blood cell undergoes extra divisions in the bone marrow, resulting in smaller cells (**Microcytosis**, MCV < 80 fL). [1] **2. Why the other options are incorrect (Causes of Macrocytosis):** * **Vitamin B12 and Folic Acid Deficiency:** These are the classic causes of **Megaloblastic Anemia**. Both are essential for DNA synthesis (specifically thymidine production). Deficiency leads to "nuclear-cytoplasmic asynchrony," where the nucleus matures slowly while the cytoplasm grows normally, resulting in large, oval red cells (**Macro-ovalocytes**, MCV > 100 fL). * **Hypothyroidism:** This is a common cause of **Non-megaloblastic macrocytosis**. The exact mechanism is multifactorial, involving altered lipid metabolism in the RBC membrane and a direct effect of thyroid hormone deficiency on erythropoiesis. **High-Yield NEET-PG Pearls:** * **MCV Ranges:** Microcytic ( 100 fL). * **Megaloblastic vs. Non-megaloblastic:** Megaloblastic macrocytosis features **hypersegmented neutrophils** (5+ lobes), whereas non-megaloblastic (Alcoholism, Liver disease, Hypothyroidism) does not. * **Thalassemia Hallmark:** Look for **Target cells** and a Mentzer Index (MCV/RBC count) **< 13**, which helps differentiate it from Iron Deficiency Anemia. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 590-591, 600-601.

Q: Thymoma may be associated with all the following conditions, EXCEPT:

Crohn's disease. **Explanation:** Thymomas are epithelial neoplasms of the thymus that are uniquely associated with a wide spectrum of **paraneoplastic autoimmune syndromes**. This association occurs because the neoplastic thymus fails to properly "educate" T-cells (defective negative selection), leading to the escape of self-reactive T-lymphocytes into the systemic circulation. **Why Crohn’s Disease is the Correct Answer:** While thymomas are linked to various autoimmune conditions, **Crohn’s disease** is notably **not** associated with thymoma. In contrast, **Ulcerative Colitis (Option C)** has a documented, albeit rare, association with thymic tumors. This distinction is a classic "except" style question in pathology exams. **Analysis of Incorrect Options:** * **Polymyositis (Option A):** Inflammatory myopathies (including polymyositis and dermatomyositis) are well-recognized paraneoplastic manifestations of thymoma, second only to Myasthenia Gravis in frequency among muscle-related associations. * **Sjogren’s Syndrome (Option B):** Various connective tissue and rheumatologic diseases, including Sjogren’s syndrome, Systemic Lupus Erythematosus (SLE), and Rheumatoid Arthritis, are associated with thymic epithelial tumors. * **Ulcerative Colitis (Option C):** Inflammatory Bowel Disease, specifically Ulcerative Colitis, is a recognized paraneoplastic association of thymoma, unlike Crohn's disease. **NEET-PG High-Yield Pearls:** 1. **Most Common Association:** **Myasthenia Gravis** (seen in ~30-45% of thymoma patients). 2. **Pure Red Cell Aplasia (PRCA):** A highly specific association; ~50% of PRCA patients have an underlying thymoma. 3. **Hypogammaglobulinemia:** Known as **Good Syndrome** (Thymoma + Hypogammaglobulinemia). 4. **Other Associations:** Graves' disease, Pernicious anemia, and Alopecia areata.

Q: Blast cells of acute lymphocytic leukemia in childhood characteristically contain which of the following?

CALLA antigen. **Explanation:** **Acute Lymphoblastic Leukemia (ALL)** is the most common childhood malignancy. The diagnosis and classification of ALL rely heavily on immunophenotyping of the blast cells. **Why CALLA is the correct answer:** The **Common Acute Lymphoblastic Leukemia Antigen (CALLA)**, also known as **CD10**, is a cell surface neutral endopeptidase. It is the most characteristic marker for the most common subtype of childhood ALL (Pre-B cell ALL). Approximately 70-80% of childhood ALL cases are "CALLA positive." Its presence is a significant diagnostic marker and was historically associated with a better prognosis compared to CALLA-negative cases. **Analysis of Incorrect Options:** * **A. Surface antigens:** While blast cells do possess surface antigens (like CD19, CD20, or CD3), this is a generic term. The question asks for a *characteristic* feature; CALLA (CD10) is the specific, high-yield antigen associated with the "common" type of ALL. * **C. Antibodies to white blood cells:** Blast cells do not contain or produce antibodies against other WBCs. This is not a feature of leukemogenesis. * **D. Thrombocytopenia:** While thrombocytopenia is a common *clinical finding* in ALL due to bone marrow infiltration (crowding out), it is a systemic hematological consequence, not a component *contained within* the blast cells themselves. **NEET-PG High-Yield Pearls:** * **Most common subtype:** L1 (FAB classification) is the most common in children; L2 is more common in adults. * **Immunophenotype:** B-cell ALL (CD19, CD20, CD10/CALLA) is more common than T-cell ALL (CD2, CD3, CD5, CD7). * **Good Prognosis Markers:** Age 1–9 years, low initial WBC count ( 50 chromosomes), and the **t(12;21)** translocation. * **Poor Prognosis Markers:** Age 10 years, high WBC count, and the **t(9;22)** Philadelphia chromosome.

Q: Pernicious anemia is due to?

Atrophic gastritis. **Explanation:** **Pernicious Anemia** is a specific type of megaloblastic anemia caused by an autoimmune process. The correct answer is **Atrophic Gastritis** (specifically Type A autoimmune atrophic gastritis) [2]. 1. **Why Atrophic Gastritis is correct:** In this condition, the body produces autoantibodies against **gastric parietal cells** and **Intrinsic Factor (IF)** [2]. The resulting chronic inflammation leads to atrophy of the gastric mucosa [2]. Since parietal cells are responsible for secreting Intrinsic Factor—which is essential for the absorption of Vitamin B12 in the terminal ileum—their destruction leads to severe Vitamin B12 deficiency, resulting in Pernicious Anemia [1]. 2. **Why other options are incorrect:** * **Iron deficiency:** Leads to microcytic hypochromic anemia, not megaloblastic anemia [3]. * **Low folic acid:** While this causes megaloblastic anemia, it is usually due to poor dietary intake or malabsorption (e.g., Celiac disease), not the autoimmune destruction of gastric mucosa seen in Pernicious Anemia. **High-Yield Clinical Pearls for NEET-PG:** * **Antibodies:** Anti-parietal cell antibodies (more sensitive) and Anti-intrinsic factor antibodies (more specific). * **Schilling Test:** Historically used to diagnose B12 malabsorption (now largely replaced by antibody testing). * **Gastric Cancer Risk:** Patients with Pernicious Anemia have a 3x increased risk of gastric adenocarcinoma and carcinoid tumors due to chronic achlorhydria and compensatory hypergastrinemia. * **Neurological Symptoms:** Unlike folate deficiency, B12 deficiency presents with **Subacute Combined Degeneration (SCD)** of the spinal cord (dorsal columns and lateral corticospinal tracts).

Q: ABO incompatibility is not seen with which of the following transfusion products?

Cryoprecipitate. The core concept behind ABO incompatibility in transfusion medicine lies in the presence of **isoagglutinins (Anti-A and Anti-B antibodies)** found in the plasma [1, 2]. **Why Cryoprecipitate is the correct answer:** Cryoprecipitate is a concentrated subset of plasma proteins prepared by thawing Fresh Frozen Plasma (FFP) at 1–6°C. It contains specific clotting factors: **Factor VIII, Von Willebrand Factor (vWF), Fibrinogen (Factor I), Factor XIII, and Fibronectin.** Because the total volume of a cryoprecipitate unit is very small (typically 10–20 mL) and it contains negligible amounts of plasma (and thus negligible isoagglutinins), it can be infused regardless of the recipient's ABO group without risk of hemolysis. **Why the other options are incorrect:** * **A. Fresh Frozen Plasma (FFP):** FFP contains the full complement of plasma antibodies [2]. Transfusing ABO-incompatible FFP (e.g., Type O plasma to a Type A recipient) can lead to a hemolytic transfusion reaction [2]. * **B & C. Platelet Rich Plasma (PRP) and Single Donor Platelets (SDP):** Platelet products are suspended in significant amounts of donor plasma. While platelets themselves do not express strong ABO antigens, the **plasma** they are stored in contains isoagglutinins. Large volumes of ABO-incompatible plasma in platelet units can cause a positive Direct Antiglobulin Test (DAT) and potential hemolysis. **High-Yield Clinical Pearls for NEET-PG:** 1. **Contents of Cryoprecipitate:** Remember the mnemonic **"8, 1, 13, and vWF"** (Factor 8, Fibrinogen/Factor 1, Factor 13, and vWF). 2. **Universal Donor for Plasma:** Type **AB** (contains no Anti-A or Anti-B antibodies) [2]. 3. **Universal Donor for RBCs:** Type **O Negative**. 4. **Indication:** Cryoprecipitate is primarily used for **hypofibrinogenemia** (e.g., in DIC or massive transfusion) and was historically used for Hemophilia A and vWD before recombinant factors became available.

Question 1

All of the following statements regarding Sickle Cell Anemia are true EXCEPT:

Accepted Answer

Adults, but not children, with sickle cell disease are functionally asplenic, making them susceptible to infections caused by encapsulated bacteria, such as pneumococci.

Answer

The shift from HbF to HbS occurs due to point mutation.

Answer

Microvascular occlusion is a severe complication of Sickle Cell Anemia.

Answer

Deoxygenation of RBCs can lead to extensive membrane damage.

Question 2

Which of the following conditions is associated with Coombs-positive hemolysis?

Accepted Answer

Systemic lupus erythematosus (SLE)

Answer

Thrombotic thrombocytopenic purpura (TTP)

Answer

Immune thrombocytopenic purpura (ITP)

Answer

Paroxysmal nocturnal hemoglobinuria (PNH)

Question 3

NESTROFT test is used for screening of:

Accepted Answer

Thalassemia

Answer

Sickle cell anemia

Answer

Paroxysmal nocturnal hemoglobinuria (PNH)

Answer

Paroxysmal cold hemoglobinuria (PCH)

Question 4

Macrocytosis is seen in all of the following disorders, except?

Accepted Answer

Thalassemia major

Answer

Hypothyroidism

Answer

Folic acid deficiency

Answer

Vitamin B12 deficiency

Question 5

A man living in southern Japan contracts HTLV-1 infection through sexual contact. Twenty-five years later he develops generalized lymphadenopathy with hepatosplenomegaly, a skin rash, hypercalcemia, and an elevated white blood count. This man has most likely developed which of the following?

Accepted Answer

Leukemia

Answer

AIDS

Answer

Autoimmunity

Answer

Delayed hypersensitivity reaction

Question 6

Thymoma may be associated with all the following conditions, EXCEPT:

Accepted Answer

Crohn's disease

Answer

Polymyositis

Answer

Sjogren's syndrome

Answer

Ulcerative colitis

Question 7

Blast cells of acute lymphocytic leukemia in childhood characteristically contain which of the following?

Accepted Answer

CALLA antigen

Answer

Surface antigens

Answer

Antibodies to white blood cells

Answer

Thrombocytopenia

Question 8

Pernicious anemia is due to?

Accepted Answer

Atrophic gastritis

Answer

Iron deficiency

Answer

Low folic acid

Answer

None of the above

Question 9

A 24-year-old male complained of recurrent attacks of sore throat for the past 2 years. His total leukocyte count was 3000/μl. A differential count revealed severe neutropenia. What is the most likely diagnosis?

Accepted Answer

Agranulocytosis

Answer

Subleukemic leukemia

Answer

Infectious mononucleosis

Answer

Leukoerythroblastic anemia

Question 10

ABO incompatibility is not seen with which of the following transfusion products?

Accepted Answer

Cryoprecipitate

Answer

Fresh frozen plasma

Answer

Platelet rich plasma

Answer

Single donor platelets

Hematopathology — MCQs

Hematopathology — MCQs

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