Hematopathology Practice Questions

Q: A 13-year-old girl presents with fatigue and weakness, found to have reduced hemoglobin. Her MCV is 70 fL, MCH is 22 pg, and RDW is 28%. What is her likely diagnosis?

Iron deficiency anemia. **Explanation:** The patient presents with **microcytic hypochromic anemia** (MCV 15%). This reflects **anisocytosis** (variation in red cell size), as the bone marrow struggles to produce uniform cells due to fluctuating iron availability. In a 13-year-old girl, IDA is the most common cause of microcytic anemia, often exacerbated by the onset of menstruation and nutritional gaps. 2. **Why other options are incorrect:** * **Thalassemia Minor:** This is the most important differential. However, Thalassemia minor typically presents with a **normal or only slightly elevated RDW** because the genetic defect results in a uniform population of small cells. The Mentzer Index (MCV/RBC count) is usually 13 in IDA. * **Thalassemia Major:** Patients usually present in infancy (6–9 months) with severe anemia, hepatosplenomegaly, and skeletal changes. A 13-year-old presenting only now with mild fatigue is unlikely to have Major. * **Sideroblastic Anemia:** While it can be microcytic, it is much rarer and often associated with a dimorphic blood picture or specific triggers (drugs/toxins). **High-Yield Clinical Pearls for NEET-PG:** * **RDW** is the earliest laboratory indicator of Iron Deficiency Anemia, rising even before hemoglobin drops. * **Mentzer Index:** MCV ÷ RBC count. If ** 13**, suspect IDA. * **Gold Standard Investigation for IDA:** Bone marrow iron stores (Prussian blue staining), though Serum Ferritin is the most sensitive non-invasive test. * **Treatment Response:** The first sign of response to oral iron therapy is a rise in **reticulocyte count**, peaking at 7–10 days.

Q: A middle-aged female presents with a lytic lesion in the lower one-third of the femur. Biopsy showed grooved nuclei and giant cells, with no periosteal reaction. What is the confirmatory investigation for this case?

CD1a and Langerin IHC. ### Explanation The clinical presentation of a lytic lesion in a middle-aged female with specific histopathological findings of **grooved nuclei** (coffee-bean appearance) and **giant cells** is characteristic of **Langerhans Cell Histiocytosis (LCH)**. While LCH is more common in children, it can present in adults, often involving the femur or skull. **1. Why CD1a and Langerin IHC is correct:** LCH is a proliferative disorder of Langerhans cells. On microscopy, these cells show characteristic nuclear grooves. The gold standard for confirmation is **Immunohistochemistry (IHC)**. Langerhans cells are positive for **CD1a, Langerin (CD207), and S-100**. Electron microscopy would show Birbeck granules (tennis-racket shaped), but IHC is the modern confirmatory investigation of choice. **2. Why other options are incorrect:** * **Serum PTH:** Elevated in Brown tumors of Hyperparathyroidism. While Brown tumors are lytic and contain giant cells, they do not feature the characteristic grooved nuclei of LCH. * **Serum Calcitonin:** Used as a marker for Medullary Thyroid Carcinoma; it has no diagnostic value for primary bone tumors. * **MRI:** While excellent for assessing the extent of marrow involvement and soft tissue components, it is not a "confirmatory" investigation as it cannot provide a histopathological or molecular diagnosis. **3. NEET-PG Clinical Pearls:** * **LCH Triad (Hand-Schüller-Christian disease):** Exophthalmos, Diabetes Insipidus, and lytic bone lesions. * **Radiology:** LCH often presents as a "punched-out" lytic lesion without a periosteal reaction. In the spine, it can cause **Vertebra Plana** (Calve’s disease). * **Differential Diagnosis:** Giant Cell Tumor (GCT) also occurs in the distal femur of young adults but is typically **epiphyseal** and lacks grooved nuclei on biopsy.

Q: In iron deficiency anemia, what is typically observed?

Increased protoporphyrin. **Explanation:** In Iron Deficiency Anemia (IDA), the correct finding is **Increased Free Erythrocyte Protoporphyrin (FEP)**. **Why the correct answer is right:** Heme synthesis occurs in the mitochondria, where the enzyme **Ferrochelatase** inserts ferrous iron ($Fe^{2+}$) into a Protoporphyrin IX ring [1]. In IDA, there is a lack of available iron to complete this reaction. Consequently, Protoporphyrin cannot be converted into Heme, leading to its accumulation within the red blood cells. This makes FEP a sensitive marker for "iron-deficient erythropoiesis." **Why the incorrect options are wrong:** * **B. Increased iron:** In IDA, serum iron levels are **decreased** due to depleted body stores. * **C. Increased ferritin:** Ferritin is the storage form of iron. It is the **first parameter to decrease** in IDA, reflecting the exhaustion of iron stores. (Note: Ferritin is an acute-phase reactant and may be falsely normal/high in inflammation). * **D. Increased transferrin saturation:** Transferrin saturation (Serum Iron/TIBC) **decreases** (typically <15%) because serum iron is low while the Total Iron Binding Capacity (TIBC) increases as the liver produces more transferrin to compensate for the deficiency [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest sign of IDA:** Decreased Serum Ferritin. * **Gold Standard investigation:** Bone marrow aspiration with **Perl’s Prussian Blue stain** (showing absent haemosiderin in macrophages). * **Mentzer Index:** (MCV/RBC count) >13 suggests IDA, whereas <13 suggests Thalassemia trait. * **Blood Picture:** Microcytic hypochromic anemia with increased RDW (Anisocytosis) [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 587-591.

Q: Bence Jones proteins are best described as:

Kappa & Lambda chains. **Explanation:** **Bence Jones proteins (BJPs)** are monoclonal globulins consisting of **free immunoglobulin light chains** (either **Kappa or Lambda**). In healthy individuals, light chains are produced in slight excess of heavy chains, but they are usually reabsorbed by the renal tubules. In plasma cell dyscrasias, particularly **Multiple Myeloma**, there is a massive overproduction of these light chains that exceeds the renal threshold, leading to their excretion in the urine. **Analysis of Options:** * **Option C (Correct):** BJPs are specifically the free light chains (Kappa or Lambda) of immunoglobulins. They are unique because of their **thermal property**: they precipitate when heated to 40–60°C and redissolve upon boiling (100°C). * **Option A & B (Incorrect):** These refer to heavy chains (Alpha and Gamma). While heavy chains are part of the complete immunoglobulin structure, they do not constitute Bence Jones proteins. * **Option D (Incorrect):** Fibrin split products (FSPs) are degradation products of fibrinogen/fibrin, typically elevated in conditions like Disseminated Intravascular Coagulation (DIC), and have no relation to immunoglobulin production. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnostic Test:** The standard urine dipstick (which detects albumin) often fails to detect BJPs. **Sulphosalicylic acid (SSA) test** or **Urine Protein Electrophoresis (UPEP)** is required for detection. * **Renal Impact:** BJPs are nephrotoxic and can lead to "Myeloma Kidney" (cast nephropathy). * **Ratio:** In Multiple Myeloma, the normal Kappa:Lambda ratio (approx. 2:1) is significantly altered. * **Amyloidosis:** BJPs are the precursors for **AL (Amyloid Light-chain) amyloidosis**.

Question 1

A 13-year-old girl presents with fatigue and weakness, found to have reduced hemoglobin. Her MCV is 70 fL, MCH is 22 pg, and RDW is 28%. What is her likely diagnosis?

Accepted Answer

Iron deficiency anemia

Answer

Thalassemia major

Answer

Sideroblastic anemia

Answer

Thalassemia minor

Question 2

Which of the following is NOT included in the differential diagnosis of a Reticulocyte Index > 2.5?

Accepted Answer

Macrocytic anemia

Answer

Hemolysis

Answer

Hemoglobinopathy

Answer

Blood loss

Question 3

A middle-aged female presents with a lytic lesion in the lower one-third of the femur. Biopsy showed grooved nuclei and giant cells, with no periosteal reaction. What is the confirmatory investigation for this case?

Accepted Answer

CD1a and Langerin IHC

Answer

Serum PTH

Answer

Serum Calcitonin

Answer

MRI

Question 4

In iron deficiency anemia, what is typically observed?

Accepted Answer

Increased protoporphyrin

Answer

Increased iron

Answer

Increased ferritin

Answer

Increased transferrin saturation

Question 5

Bence Jones proteins are best described as:

Accepted Answer

Kappa & Lambda chains

Answer

Chains

Answer

G chains

Answer

Fibrin split products

Question 6

Absolute lymphocytosis is seen in which of the following conditions?

Accepted Answer

Tuberculosis (TB)

Answer

Systemic Lupus Erythematosus (SLE)

Answer

Chronic Lymphocytic Leukemia (CLL)

Answer

Brucellosis

Question 7

A female with recurrent abortion and isolated prolonged APTT is most likely associated with which of the following?

Accepted Answer

Lupus anticoagulant

Answer

Disseminated intravascular coagulation (DIC)

Answer

Von Willebrand disease

Answer

Hemophilia

Question 8

Aplastic anemia is seen in all of the following conditions EXCEPT?

Accepted Answer

Hepatitis A infection

Answer

Paroxysmal nocturnal hemoglobinuria

Answer

Chloramphenicol therapy

Answer

Human immunodeficiency virus infection

Question 9

Haptoglobin levels are decreased in which of the following conditions?

Accepted Answer

All of the above

Answer

Mismatched transfusion reactions

Answer

Thalassemia

Answer

G6PD deficiency

Question 10

Which immunohistochemical marker is most useful in differentiating thymoma from acute lymphoblastic leukemia (ALL)?

Accepted Answer

Cytokeratin

Answer

CD1a

Answer

CD3

Answer

TdT

Hematopathology — MCQs

Hematopathology — MCQs

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