Hematopathology — MCQs

Hematopathology Indian Medical PG Practice Questions and MCQs

Question 1061: A patient presents with microcytic hypochromic anaemia. Laboratory investigations reveal reduced total serum iron, reduced percentage saturation of serum transferrin, and increased serum ferritin levels. What is the most likely diagnosis?

A. Iron deficiency anaemia
B. Anaemia of chronic disease (Correct Answer)
C. Sideroblastic anaemia
D. Pernicious anaemia

Explanation: The correct answer is **Anaemia of Chronic Disease (ACD)**. ### **Explanation of the Correct Answer** The key to this question lies in the **Serum Ferritin** levels. In ACD, the body has sufficient iron stores, but they are "locked away" due to the action of **Hepcidin** [1]. Hepcidin is an acute-phase reactant released during chronic inflammation (IL-6 mediated). It degrades ferroportin, preventing iron release from macrophages and absorption from the gut [1]. * **Serum Iron:** Low (sequestration in macrophages) [1]. * **Transferrin Saturation:** Low (less iron available to bind). * **Serum Ferritin:** **Increased** (reflects trapped iron stores in macrophages) [1]. ### **Why the Other Options are Incorrect** * **Iron Deficiency Anaemia (IDA):** While it presents with low serum iron and low saturation, the **ferritin is always low**, reflecting depleted body stores. This is the most important differentiator from ACD. * **Sideroblastic Anaemia:** Characterized by a failure to incorporate iron into protoporphyrin. This leads to an **iron overload state** with increased serum iron, increased saturation, and increased ferritin. * **Pernicious Anaemia:** This is a megaloblastic anaemia caused by Vitamin B12 deficiency. It presents with **macrocytic** (not microcytic) indices and hypersegmented neutrophils. ### **NEET-PG High-Yield Pearls** * **Gold Standard for Iron Stores:** Bone marrow aspiration (Prussian Blue staining) showing increased iron in macrophages but absent iron in erythroblasts (sideroblasts). * **TIBC (Total Iron Binding Capacity):** In ACD, TIBC is usually **low or normal**, whereas in IDA, TIBC is **increased**. * **Soluble Transferrin Receptor (sTfR):** This is **normal** in ACD but **elevated** in IDA, making it a useful marker when both conditions coexist. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 658-662.

Question 1062: In hereditary spherocytosis, an inherited abnormality is seen in which of the following red blood cell components?

A. A-globin chain
B. a-globin chain
C. Phosphatidylinositol glycan A
D. Spectrin (Correct Answer)

Explanation: **Explanation:** **Hereditary Spherocytosis (HS)** is an autosomal dominant disorder characterized by a defect in the **red blood cell (RBC) membrane skeleton** [1]. The primary pathology involves a deficiency or abnormality in proteins that tether the lipid bilayer to the underlying cytoskeleton. 1. **Why Spectrin is Correct:** The most common molecular defects in HS involve **Ankyrin** (most common overall), **Spectrin (α or β)**, Band 3, or Protein 4.2 [1]. A deficiency in Spectrin destabilizes the membrane, leading to the loss of membrane fragments (microvesiculation). This reduces the surface-area-to-volume ratio, forcing the cell to assume a **spherical shape** [1]. These spherocytes are non-deformable and are prematurely destroyed in the splenic sinusoids (extravascular hemolysis) [1], [2]. 2. **Why Other Options are Incorrect:** * **Options A & B (α and β-globin chains):** Defects in globin chain synthesis or structure are characteristic of **Hemoglobinopathies** (e.g., Sickle Cell Anemia) and **Thalassemias**, not membrane defects. * **Option C (Phosphatidylinositol glycan A - PIGA):** Mutations in the *PIGA* gene lead to a deficiency of GPI-anchored proteins (like CD55 and CD59) on the RBC surface, which is the hallmark of **Paroxysmal Nocturnal Hemoglobinuria (PNH)** [3]. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Test:** Eosin-5-maleimide (EMA) binding test (Flow cytometry). * **Confirmatory Test:** Osmotic Fragility Test (increased fragility) [2]. * **Peripheral Smear:** Spherocytes (small, dark cells lacking central pallor) and polychromasia (reticulocytosis) [2]. * **Clinical Triad:** Anemia, Splenomegaly, and Jaundice. * **Complication:** Increased risk of **pigment gallstones** (calcium bilirubinate) and aplastic crisis (associated with Parvovirus B19) [2]. * **MCHC:** Characteristically **increased** (>36 g/dl) due to mild cell dehydration. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 640-641. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 597-598. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 596-597.

Question 1063: Iron levels are decreased in all of the following conditions except:

A. Anemia due to chronic infection
B. Sideroblastic anemia (Correct Answer)
C. Anemia due to gastric ulcer (bleeding ulcer)
D. Hookworm anemia

Explanation: **Explanation:** The core concept tested here is the distinction between iron deficiency and iron utilization defects. In **Sideroblastic Anemia**, the primary defect is in heme synthesis (often due to ALA synthase deficiency or mitochondrial dysfunction), not a lack of iron. Consequently, iron is absorbed normally but cannot be incorporated into hemoglobin. This leads to an **increase in serum iron**, high ferritin levels, and the characteristic "ringed sideroblasts" (iron-laden mitochondria surrounding the nucleus) in the bone marrow. **Analysis of Options:** * **Anemia due to chronic infection (ACD):** Driven by **Hepcidin**, which sequesters iron in macrophages and reduces intestinal absorption [1]. This results in **low serum iron** despite adequate total body stores [2]. * **Anemia due to gastric ulcer:** Chronic bleeding from a peptic ulcer leads to persistent blood loss [3]. Since most of the body's iron is in RBCs, chronic hemorrhage eventually depletes iron stores, causing **low serum iron** [4]. * **Hookworm anemia:** *Ancylostoma duodenale* and *Necator americanus* suck blood from the intestinal mucosa. This chronic blood loss is a classic cause of iron deficiency anemia in endemic areas, leading to **low serum iron** [4]. **NEET-PG High-Yield Pearls:** * **Sideroblastic Anemia:** Look for "Pappenheimer bodies" on peripheral smear and "Ringed Sideroblasts" (Prussian Blue stain) in the marrow. * **Common Causes:** Alcohol (most common), Lead poisoning, Isoniazid (B6 deficiency), and X-linked ALA-S2 mutation. * **Iron Profile in Sideroblastic Anemia:** ↑ Serum Iron, ↑ Ferritin, ↓ TIBC, and ↑ Transferrin Saturation (similar to Hemochromatosis). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 660-662. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 658-659. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, p. 638. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 659-660.

Question 1064: Splenic infarction is associated with which of the following conditions?

A. Typhoid
B. Infectious mononucleosis
C. Chronic Myeloid Leukemia (CML)
D. Paroxysmal nocturnal hemoglobinuria (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Paroxysmal nocturnal hemoglobinuria (PNH)** **Why PNH is the correct answer:** Paroxysmal nocturnal hemoglobinuria is a unique acquired clonal stem cell disorder characterized by a deficiency of glycosylphosphatidylinositol (GPI) anchor proteins (CD55 and CD59) [1]. This deficiency makes red cells, platelets, and WBCs hypersensitive to complement-mediated lysis [2]. The hallmark of PNH is a **hypercoagulable state**. Thrombosis is the leading cause of death in these patients [1]. While venous thrombosis (e.g., Budd-Chiari syndrome, cerebral veins) is more common, **arterial thrombosis and embolic events** can lead to **splenic infarction**. **Analysis of Incorrect Options:** * **A. Typhoid:** This typically presents with **splenomegaly** (soft, "congestive" spleen) due to lymphoid hyperplasia and erythrophagocytosis in the sinusoids, but not infarction. * **B. Infectious Mononucleosis:** Caused by EBV, it leads to significant splenomegaly. The primary splenic complication here is **splenic rupture** (due to a thin capsule and rapid expansion), not infarction. * **C. Chronic Myeloid Leukemia (CML):** While massive splenomegaly in CML *can* occasionally lead to infarction due to the blood supply outstripping the organ's size, it is not the classic association compared to the primary thrombotic nature of PNH in the context of this specific question. (Note: In many textbooks, CML is listed as a cause of splenic infarct; however, in the context of NEET-PG, PNH is the high-yield "pro-thrombotic" association). **High-Yield Clinical Pearls for NEET-PG:** * **PNH Triad:** Hemolytic anemia, Pancytopenia, and Venous thrombosis. * **Gold Standard Test:** Flow cytometry for CD55/CD59. * **Ham’s Test/Sucrose Lysis Test:** Historical tests now replaced by flow cytometry. * **Splenic Infarct Morphology:** Characteristically **wedge-shaped**, subcapsular, and pale (anemic) due to the organ's end-arterial circulation. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 650-651. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 601-602.

Question 1065: Which of the following disorders is least likely to be associated with a prolonged bleeding time?

A. Thrombocytopenia
B. Platelet dysfunction
C. Coagulation factor deficiencies (Correct Answer)
D. Disseminated Intravascular Coagulation (DIC)

Explanation: **Explanation:** The **Bleeding Time (BT)** is a clinical test that measures the efficiency of **primary hemostasis**, which involves the formation of the initial platelet plug. Primary hemostasis depends on three factors: adequate platelet count, normal platelet function, and healthy vessel walls [1]. **1. Why Coagulation Factor Deficiencies (Option C) is the correct answer:** Coagulation factor deficiencies (e.g., Hemophilia A or B) affect **secondary hemostasis**—the coagulation cascade that forms a stable fibrin clot [2]. Since primary hemostasis (platelet plug formation) remains intact in these disorders, the Bleeding Time is typically **normal** [3]. Instead, these conditions are characterized by a prolonged Prothrombin Time (PT) or Activated Partial Thromboplastin Time (aPTT). **2. Analysis of Incorrect Options:** * **Thrombocytopenia (A):** A low platelet count directly impairs the formation of the platelet plug, leading to a prolonged BT [1]. * **Platelet Dysfunction (B):** Conditions like Glanzmann thrombasthenia, Bernard-Soulier syndrome, or aspirin use impair platelet aggregation or adhesion, resulting in a prolonged BT despite a normal platelet count [1]. * **Disseminated Intravascular Coagulation (D):** DIC is a complex consumptive coagulopathy. It involves both the consumption of platelets (thrombocytopenia) and clotting factors [2]. Because platelets are depleted, the BT is frequently prolonged. **High-Yield Clinical Pearls for NEET-PG:** * **Isolated prolonged BT:** Think of Platelet dysfunction or von Willebrand Disease (vWD). * **vWD Exception:** von Willebrand Disease is unique because it can show both a prolonged BT (impaired adhesion) and a prolonged aPTT (due to low Factor VIII levels) [2]. * **Rule of Thumb:** Bleeding time = Platelet/Vessel wall problem; PT/aPTT = Coagulation factor problem. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 619-620. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 622-625. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 670-671.

Question 1066: What condition is characterized by the presence of leptocytes in blood smears?

A. Sickle cell anemia
B. Thalassemia (Correct Answer)
C. Post splenectomy
D. Uremia

Explanation: **Explanation:** **Leptocytes**, also known as **Target Cells** or Codocytes, are characterized by a central spot of hemoglobin surrounded by a clear ring and a peripheral rim of hemoglobin, resembling a bullseye. This morphology occurs due to an **increased surface-area-to-volume ratio**, where there is either excess membrane or decreased hemoglobin content. 1. **Why Thalassemia is correct:** In Thalassemia, there is a quantitative defect in globin chain synthesis leading to **hypochromia** (reduced hemoglobin volume) [1]. The cell membrane remains relatively redundant compared to the sparse hemoglobin inside, causing the membrane to collapse and "pouch" in the center, creating the characteristic target appearance [2]. 2. **Analysis of Incorrect Options:** * **Sickle Cell Anemia:** Characterized primarily by **Drepanocytes** (sickle cells) due to HbS polymerization. While target cells can occasionally be seen in HbC disease or S-Thalassemia, they are not the hallmark of pure Sickle Cell Anemia. * **Post-Splenectomy:** While target cells *can* appear here (due to lack of splenic "pitting" of excess membrane), Thalassemia is the classic and more frequent association in exam contexts. Post-splenectomy is better known for **Howell-Jolly bodies** and Pappenheimer bodies. * **Uremia:** Characterized by **Echinocytes** (Burr cells), which are serrated cells with small, uniform projections. **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic for Target Cells (HALT):** **H**bC disease, **A**splenia, **L**iver disease (obstructive jaundice), and **T**halassemia [1]. * In **Liver Disease**, leptocytes form due to increased cholesterol-to-phospholipid ratios, which increases the surface area of the RBC membrane. * Leptocytes are **more resistant to osmotic lysis** (decreased osmotic fragility) because the excess membrane allows them to swell more than normal cells before bursting. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 590-591. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 600-601.

Question 1067: All of the following statements about Hodgkin's lymphoma are true EXCEPT?

A. It is less aggressive than non-Hodgkin's lymphoma.
B. Single lymph node involvement is common.
C. Spread occurs in a continuous fashion.
D. Systemic involvement is more common than in non-Hodgkin's lymphoma. (Correct Answer)

Explanation: ### Explanation The correct answer is **D**. In Hodgkin’s Lymphoma (HL), systemic involvement (extranodal spread to the bone marrow, liver, or CNS) is **less common** than in Non-Hodgkin’s Lymphoma (NHL) [1]. NHL is characterized by frequent hematogenous spread and involvement of Waldeyer’s ring and mesenteric nodes, whereas HL remains localized to axial lymph nodes for longer periods [2]. #### Analysis of Options: * **Option A (Incorrect):** HL is generally considered **less aggressive** and more curable than many subtypes of NHL. It has a predictable clinical course and a high response rate to chemotherapy (ABVD regimen). * **Option B (Incorrect):** HL typically originates in a **single lymph node group** (most commonly cervical, mediastinal, or axillary) [1]. * **Option C (Incorrect):** A hallmark of HL is its **orderly, contiguous spread** to the next anatomical chain of lymph nodes (e.g., from cervical to mediastinal) [2]. In contrast, NHL often presents with "skip" lesions. #### NEET-PG High-Yield Pearls: 1. **Cellular Composition:** Unlike NHL, where the bulk of the tumor is malignant cells, in HL, the malignant **Reed-Sternberg (RS) cells** make up only 1–5% of the tumor mass; the rest is a reactive inflammatory background [1]. 2. **B-Symptoms:** Fever, night sweats, and weight loss are classic in HL and carry prognostic significance (Ann Arbor Staging) [2]. 3. **RS Cell Markers:** Classic HL (MC, NS, LR, LD subtypes) is typically **CD15+ and CD30+**, but **CD45-**. The Nodular Lymphocyte Predominant (NLPHL) variant is **CD20+ and CD45+** (Popcorn cells). 4. **Epidemiology:** HL shows a **bimodal age distribution** (peaks at 15–35 years and >50 years) [1]. **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. 614-616. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 557-558.

Question 1068: What is the shelf life of gamma-irradiated packed red blood cells (pRBCs)?

A. 21 days
B. 28 days (Correct Answer)
C. 35 days
D. 42 days

Explanation: **Explanation:** The shelf life of gamma-irradiated packed red blood cells (pRBCs) is **28 days** from the date of irradiation or the original expiry date of the unit, whichever comes first. **Why 28 days?** Gamma irradiation (usually 25 Gy) is performed to prevent **Transfusion-Associated Graft-Versus-Host Disease (TA-GVHD)** by inactivating donor T-lymphocytes. However, the radiation damages the RBC membrane, leading to increased potassium leakage (hyperkalemia) and a decrease in ATP and 2,3-DPG levels. This accelerated metabolic decay reduces the post-transfusion survival of the RBCs, necessitating a shortened shelf life of 28 days to ensure clinical efficacy and safety. **Analysis of Options:** * **A. 21 days:** This is the shelf life of whole blood or pRBCs collected in **CPD** (Citrate Phosphate Dextrose) anticoagulant without additive solutions. * **C. 35 days:** This is the standard shelf life for pRBCs collected in **CPDA-1** (Citrate Phosphate Dextrose Adenine) anticoagulant. * **D. 42 days:** This is the shelf life for pRBCs stored with **additive solutions** like SAGM (Saline Adenine Glucose Mannitol) or ADSOL. **High-Yield Clinical Pearls for NEET-PG:** * **Indication:** Irradiation is mandatory for immunocompromised patients (e.g., Hodgkin lymphoma, bone marrow transplant), intrauterine transfusions, and directed donations from first-degree relatives. * **Dose:** The central dose of irradiation should be **25 Gray (Gy)**, with no part receiving less than 15 Gy. * **Potassium Warning:** Because irradiation increases extracellular potassium, irradiated units should be transfused immediately (or within 24 hours) in neonatal or large-volume exchange transfusions to avoid cardiac arrhythmias.

Question 1069: What is the MCHC criterion for diagnosing iron deficiency anemia?

A. <32 g/dL
B. <34 g/dL (Correct Answer)
C. <28 g/dL
D. <30 g/dL

Explanation: **Explanation:** **Iron Deficiency Anemia (IDA)** is characterized by a defect in hemoglobin synthesis, leading to a **microcytic hypochromic** blood picture [1]. Mean Corpuscular Hemoglobin Concentration (MCHC) measures the average concentration of hemoglobin in a given volume of packed red blood cells. 1. **Why Option B is correct:** The normal range for MCHC is typically **32–36 g/dL**. In IDA, as hemoglobin synthesis fails, the cells become increasingly pale (hypochromic). A value **<34 g/dL** is the established diagnostic threshold for hypochromia in most clinical and academic textbooks (including Robbins and Wintrobe). It is often the earliest indicator of reduced hemoglobin concentration within the RBCs before significant morphological changes occur. 2. **Analysis of Incorrect Options:** * **Option A (<32 g/dL):** While this value definitely indicates hypochromia, it is considered a more advanced stage of depletion. The diagnostic "cutoff" begins at the lower end of the normal physiological range (<34 g/dL). * **Options C & D (<28 and <30 g/dL):** These represent severe hypochromia. While seen in chronic, untreated IDA, they are not the "criterion" for diagnosis; using these would miss many early cases of IDA. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Sign of IDA:** Increased **RDW** (Red Cell Distribution Width) is often the first change in the peripheral smear. * **Gold Standard Diagnosis:** Bone marrow aspiration showing absence of stainable iron (**Prussian Blue/Perl’s stain**). * **Mentzer Index:** MCV/RBC count. If **>13**, it suggests IDA; if **<13**, it suggests Thalassemia trait. * **MCHC in Spherocytosis:** Hereditary Spherocytosis is the only condition where MCHC is characteristically **increased** (>36 g/dL). **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 590-591.

Question 1070: "Smudge cells" in the peripheral smear are characteristic of?

A. Chronic myelogenous leukemia
B. Chronic lymphocytic leukemia (Correct Answer)
C. Acute myelogenous leukemia
D. Acute lymphoblastic leukemia

Explanation: **Explanation:** **Chronic Lymphocytic Leukemia (CLL)** is the correct answer because smudge cells (also known as basket cells) are the classic morphological hallmark of this condition [1]. **Why Smudge Cells occur in CLL:** In CLL, the peripheral blood is dominated by small, mature-looking B-lymphocytes. However, these neoplastic cells possess an abnormal cytoskeleton, making them extremely fragile [1]. When a peripheral blood film is prepared, the mechanical pressure of the spreader slide causes these fragile lymphocytes to rupture, resulting in crushed nuclei that appear as pale, feathery, eosinophilic "smudges" lacking a defined cell membrane or cytoplasm [1]. **Analysis of Incorrect Options:** * **Chronic Myelogenous Leukemia (CML):** Characterized by a "myeloid bulge" (presence of cells at all stages of granulocytic differentiation) and increased basophils/eosinophils. Cells are generally robust and do not smudge easily. * **Acute Myelogenous Leukemia (AML):** Defined by the presence of myeloblasts, often containing **Auer rods**. * **Acute Lymphoblastic Leukemia (ALL):** While lymphoblasts are present, they do not typically exhibit the extreme fragility seen in the mature B-cells of CLL. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** If smudge cells are numerous, adding a drop of **bovine albumin** to the blood sample before making the smear can stabilize the cells and allow for better visualization of morphology. * **Immunophenotype:** CLL is characterized by the co-expression of **CD5** (a T-cell marker) and **CD19/CD20/CD23** (B-cell markers) [1]. * **Prognosis:** The presence of smudge cells is actually a good prognostic indicator; a higher percentage of smudge cells correlates with longer progression-free survival. **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, p. 602.

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