Hematopathology Practice Questions

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.

Q: In which of the following conditions can Downey cells be seen?

Infectious mononucleosis. **Explanation:** **Infectious Mononucleosis (IM)** is the classic condition associated with **Downey cells** [1]. These are **atypical T-lymphocytes** (specifically CD8+ cytotoxic T-cells) that have been activated in response to B-cells infected by the **Epstein-Barr Virus (EBV)**. Morphologically, Downey cells are larger than mature lymphocytes, featuring abundant, "balloons-out" cytoplasm that often indents or "hugs" adjacent red blood cells, and a nucleus with coarse or smudged chromatin [1]. **Analysis of Incorrect Options:** * **Small Lymphocytic Lymphoma (SLL):** Characterized by small, mature-looking lymphocytes and "Smudge cells" (fragile cells that burst during smear preparation), not atypical reactive T-cells. * **Acute Myeloid Leukemia (AML):** Defined by the presence of myeloblasts (containing Auer rods) rather than reactive lymphocytes. * **Multiple Myeloma:** A plasma cell dyscrasia characterized by malignant plasma cells in the bone marrow, often showing "Fried egg" appearance or "Mott cells," but not Downey cells. **High-Yield Clinical Pearls for NEET-PG:** * **Triad of IM:** Fever, pharyngitis, and lymphadenopathy (posterior cervical) [1]. * **Diagnosis:** Heterophile antibody test (**Monospot test**) is the screening gold standard. * **The "Indentation" Sign:** The cytoplasm of Downey cells scalloping around RBCs is a classic morphological descriptor in exams [1]. * **Complication:** Avoid contact sports due to the risk of **splenic rupture**. * **Antibiotic Caution:** Administration of Ampicillin/Amoxicillin in IM patients often results in a characteristic maculopapular rash. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, pp. 369-370.

Q: This is the peripheral smear of which disease?

Sickle cell anemia. ***Sickle cell anemia*** - The peripheral smear shows characteristic **drepanocytes** (sickle-shaped red blood cells) which are pathognomonic for sickle cell anemia. - These **crescent-shaped cells** result from **hemoglobin S polymerization** under deoxygenated conditions, causing the distinctive morphology. *Thalassemia* - Shows **microcytic hypochromic** red blood cells with **target cells** and **tear drop cells**, not sickle-shaped cells. - **Hemoglobin electrophoresis** would reveal elevated **HbA2** and **HbF** levels, distinguishing it from sickle cell disease. *Iron deficiency anemia* - Characterized by **microcytic hypochromic** red blood cells that are small and pale with increased **central pallor**. - Shows **pencil cells** and **target cells** occasionally, but never the characteristic **sickle-shaped morphology**. *Sideroblastic anemia* - Demonstrates a **dimorphic blood picture** with both **microcytic** and **normocytic** red blood cells present. - **Ringed sideroblasts** are seen in bone marrow with **Prussian blue staining**, but peripheral smear lacks sickle cells.

Question 1

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 2

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 3

Pernicious anemia is due to?

Accepted Answer

Atrophic gastritis

Answer

Iron deficiency

Answer

Low folic acid

Answer

None of the above

Question 4

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 5

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

Question 6

The expression of JAK2 mutation is seen in all conditions, EXCEPT:

Accepted Answer

Chronic eosinophilic leukemia

Answer

Primary myelofibrosis

Answer

Polycythemia vera

Answer

Essential thrombocytosis

Question 7

All of the following are true regarding Chronic Lymphocytic Leukemia (CLL) except?

Accepted Answer

Affects T-cells

Answer

Most common type of leukemia in adults

Answer

Males are commonly affected

Answer

ZAP-70 has prognostic importance

Question 8

In which of the following conditions can Downey cells be seen?

Accepted Answer

Infectious mononucleosis

Answer

Small lymphocytic lymphoma

Answer

Acute myeloid leukemia

Answer

Multiple myeloma

Question 9

All of the following statements about Mucosa Associated Lymphoid Tissue (MALT) lymphomas are true, except:

Accepted Answer

Present as stromal polyps

Answer

Present at extranodal sites

Answer

Predisposed by H. pylori infection

Answer

Are sensitive to chemotherapy

Question 10

This is the peripheral smear of which disease?

Accepted Answer

Sickle cell anemia

Answer

Thalassemia

Answer

Iron deficiency anemia

Answer

Sideroblastic anemia

Hematopathology — MCQs

Hematopathology — MCQs

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