Hematopathology Practice Questions

Q: All of the following are features of hemolytic anemia except?

Bilirubin in urine. **Explanation:** The core concept in hemolytic anemia is the premature destruction of Red Blood Cells (RBCs), leading to an increase in **unconjugated bilirubin** (indirect bilirubin) [1]. 1. **Why "Bilirubin in urine" is the correct answer (The Exception):** In hemolytic anemia, the liver is overwhelmed by the excess production of unconjugated bilirubin. However, unconjugated bilirubin is **lipid-soluble** and bound to albumin; it cannot pass through the glomerular basement membrane [1]. Therefore, it does not appear in the urine (**acholuric jaundice**). Bilirubinuria only occurs when there is an increase in *conjugated* (water-soluble) bilirubin, typically seen in obstructive jaundice or hepatitis. 2. **Analysis of Incorrect Options:** * **Decreased RBC life span:** This is the definition of hemolysis. Normal RBCs live ~120 days; in hemolytic anemia, this is significantly reduced [1]. * **Altered Erythroid to Myeloid (E:M) ratio:** Normally, the E:M ratio is 1:3 or 1:4. In hemolysis, the bone marrow compensates for RBC loss by undergoing **erythroid hyperplasia**, which reverses or alters this ratio (e.g., 1:1 or higher). * **Decreased Haptoglobin:** Haptoglobin is a plasma protein that binds free hemoglobin released from lysed RBCs. During intravascular hemolysis, haptoglobin levels drop significantly as it is consumed while clearing free hemoglobin. **NEET-PG High-Yield Pearls:** * **Urine Findings:** In hemolysis, urine contains increased **Urobilinogen** but **NO Bilirubin** [1]. * **Markers of Hemolysis:** ↑ Reticulocyte count, ↑ LDH (Lactate Dehydrogenase), ↓ Haptoglobin, and ↑ Indirect Bilirubin [1]. * **Schistocytes:** Presence on a peripheral smear indicates microangiopathic hemolytic anemia (MAHA).

Q: All of the following blood group systems are known to cause hemolytic disease of the fetus and newborn except?

Lewis. **Explanation:** Hemolytic Disease of the Fetus and Newborn (HDFN) occurs when maternal IgG antibodies cross the placenta and attack fetal red blood cells (RBCs) carrying the corresponding paternal antigen. **Why Lewis is the correct answer:** The Lewis blood group system (Le^a, Le^b) does not cause HDFN for two primary reasons: 1. **Antibody Type:** Lewis antibodies are typically **IgM**, which are large pentamers that cannot cross the placenta. 2. **Antigen Expression:** Lewis antigens are not intrinsic to the RBC membrane; they are adsorbed from the plasma. In fetuses and neonates, these antigens are poorly expressed on RBCs, making them "Lewis negative" at birth. Therefore, even if antibodies were present, there is no target on fetal cells. **Analysis of Incorrect Options:** * **Kell (Option A):** The anti-K antibody is the second most common cause of severe HDFN after RhD. It is unique because it causes hemolysis AND suppresses fetal erythropoiesis in the bone marrow. * **Duffy (Option B):** Anti-Fy^a and anti-Fy^b are IgG antibodies that can cross the placenta and cause mild to moderate HDFN. * **Kidd (Option C):** Anti-Jk^a and anti-Jk^b are IgG antibodies known to cause HDFN, though cases are usually mild. **NEET-PG High-Yield Pearls:** * **Most common cause of HDFN:** ABO incompatibility (usually mild). * **Most common cause of severe HDFN:** RhD incompatibility. * **Kell Sensitization:** Unlike Rh, Kell HDFN presents with lower bilirubin levels because it causes anemia via erythroid suppression rather than just hemolysis. * **"I" and "P" systems:** Like Lewis, these are typically IgM and do not cause HDFN.

Q: What is the term for localized Langerhans cell histiocytosis affecting the head and neck?

Eosinophilic granuloma. **Explanation:** **Langerhans Cell Histiocytosis (LCH)** is a spectrum of disorders characterized by the clonal proliferation of Langerhans cells (expressing CD1a, S100, and CD207/Langerin) [1]. The clinical presentation depends on the extent of involvement. **Why Eosinophilic Granuloma is correct:** **Eosinophilic Granuloma** is the most benign and localized form of LCH. It typically presents as a **solitary, osteolytic lesion** in the bones, most commonly affecting the skull (head), mandible (neck), ribs, or femur. It is usually seen in older children or young adults and carries an excellent prognosis. **Analysis of Incorrect Options:** * **A. Letterer-Siwe disease:** This is the **acute disseminated** (multisystem) form of LCH, typically occurring in infants under age 2. It involves multiple organs (skin, liver, spleen, bone marrow) and has a poor prognosis. * **B. Pulmonary LCH:** This is a localized form specifically affecting the lungs, almost exclusively seen in **adult smokers**. While localized, it is not the classic term for head and neck bone involvement. * **Hand-Schüller-Christian disease (Note):** Though not an option, this is the chronic disseminated form characterized by the classic triad of calvarial bone defects, diabetes insipidus, and exophthalmos. **NEET-PG High-Yield Pearls:** 1. **Birbeck Granules:** Pathognomonic electron microscopy finding; described as **"tennis-racket"** shaped pentalaminar structures [1]. 2. **Immunohistochemistry (IHC):** Positive for **CD1a, S100, and Langerin (CD207)** [1]. 3. **BRAF V600E Mutation:** Present in approximately 50% of LCH cases [1]. 4. **Radiology:** "Punched-out" radiolucent lesions without a sclerotic rim are characteristic in the skull. **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. 629-630.

Q: What is the main cause of congestive splenomegaly?

Banti syndrome. **Explanation:** **Banti Syndrome (Non-Cirrhotic Portal Fibrosis)** is the correct answer because it is the classic prototype of **congestive splenomegaly**. The underlying medical concept involves an increase in portal venous pressure (portal hypertension) due to pre-hepatic or intra-hepatic (non-cirrhotic) obstruction [1]. This back-pressure leads to chronic venous congestion of the spleen, resulting in massive splenomegaly, hypersplenism (anemia, leukopenia, thrombocytopenia), and esophageal varices, typically in the absence of primary liver cirrhosis [1]. **Analysis of Incorrect Options:** * **Congestive Cardiac Failure (CCF):** While CCF causes systemic venous congestion, it primarily leads to **congestive hepatomegaly** ("nutmeg liver") [2]. Splenomegaly in CCF is usually mild and occurs only if secondary cardiac cirrhosis develops. * **Malaria:** This causes splenomegaly due to **reticuloendothelial hyperplasia** (increased clearance of parasitized RBCs) and immune activation, rather than passive venous congestion. * **DIC:** This is a consumptive coagulopathy characterized by microvascular thrombosis and hemorrhage. It does not typically cause splenomegaly. **High-Yield Clinical Pearls for NEET-PG:** * **Banti’s Syndrome** is often used interchangeably with **Non-Cirrhotic Portal Fibrosis (NCPF)** in the Indian subcontinent. * **Microscopic hallmark:** Fibrosis of the Malpighian corpuscles and the presence of **Gandy-Gamma bodies** (siderofibrotic nodules containing calcium and iron) are characteristic of chronic congestive splenomegaly. * **Key differentiator:** In Banti syndrome, liver function tests (LFTs) are usually normal, unlike in cirrhosis [1].

Q: A child presents with Hb of 6.5 gm%, MCV of 65, MCH of 15, and protoporphyria with a much reduced red cell distribution width. What is the most likely diagnosis?

Iron deficiency anemia. This question tests your ability to differentiate between microcytic hypochromic anemias using red cell indices and biochemical markers. ### **Explanation of the Correct Answer** The patient presents with **Iron Deficiency Anemia (IDA)**. * **Microcytic Hypochromic Picture:** Hb 6.5 g%, MCV 65 fL (low), and MCH 15 pg (low) indicate microcytic hypochromic anemia. * **Protoporphyria:** In IDA, iron is unavailable to combine with protoporphyrin to form Heme. This leads to an accumulation of **Free Erythrocyte Protoporphyrin (FEP)**, a classic biochemical marker for IDA. * **RDW (Red Cell Distribution Width):** While the question mentions a "reduced" RDW, it is important to note that in clinical practice, IDA typically shows an **increased RDW** (anisocytosis). However, among the given options, the combination of microcytosis and elevated protoporphyrin is pathognomonic for IDA. ### **Why Other Options are Incorrect** * **Thalassemia:** While it presents with a low MCV and very low RDW (Mentzer index <13), **protoporphyrin levels are normal** because there is no defect in heme synthesis; the defect lies in globin chain production. * **Porphyria:** These are enzymatic defects in the heme synthesis pathway. While they involve protoporphyrins, they do not typically present with this specific microcytic blood picture or low iron indices. * **Megaloblastic Anemia:** This is a **macrocytic** anemia (MCV >100 fL), which contradicts the provided MCV of 65. ### **NEET-PG High-Yield Pearls** 1. **Mentzer Index:** MCV/RBC count. If ** 13**, suspect IDA. 2. **RDW:** The earliest sign of IDA is an increase in RDW. 3. **Gold Standard:** Bone marrow aspiration (Perl’s Prussian blue stain) is the gold standard for IDA, but **Serum Ferritin** is the best initial screening test. 4. **FEP:** Elevated in IDA and Lead Poisoning, but normal in Thalassemia.

Question 1

All of the following are features of hemolytic anemia except?

Accepted Answer

Bilirubin in urine

Answer

Decreased RBC life span

Answer

Altered erythroid and myeloid ratio

Answer

Decreased haptoglobin

Question 2

A 56-year-old female presents with headache, dizziness, generalized itching (especially after hot showers), and intense burning in her hands and feet, which is relieved by aspirin. Physical examination reveals splenomegaly and elevated blood pressure. Laboratory findings include HB: 20.1 g/dl, Hematocrit: 60%, WBC: 15,800, Platelet count: 500,000, low EPO, SpO2: 98%, and increased LAP. The patient is positive for JAK2V617F mutation. Which of the following histopathology slides corresponds to this clinical condition?

Accepted Answer

None of the above.

Answer

Histopathology slide A

Answer

Histopathology slide B

Answer

Histopathology slide C

Question 3

Bone marrow in Amyloid Lightchain Amyloidosis shows which of the following features?

Accepted Answer

Bone marrow plasmacytosis

Answer

Granulomatous reaction

Answer

Fibrosis

Answer

Giant cell formation

Question 4

All of the following blood group systems are known to cause hemolytic disease of the fetus and newborn except?

Accepted Answer

Lewis

Answer

Kell

Answer

Duffy

Answer

Kidd

Question 5

What is the term for localized Langerhans cell histiocytosis affecting the head and neck?

Accepted Answer

Eosinophilic granuloma

Answer

Letterer-Siwe disease

Answer

Pulmonary Langerhans cell histiocytosis

Answer

None of the above

Question 6

What is the most common cause of beta thalassemia?

Accepted Answer

Mutations leading to aberrant RNA splicing.

Answer

Mutations lie within the β-globin promoter and lower the rate of β-globin gene transcription.

Answer

Mutations involve the coding regions of the β-globin gene.

Answer

All of the above are equally common.

Question 7

What is the main cause of congestive splenomegaly?

Accepted Answer

Banti syndrome

Answer

Congestive Cardiac Failure (CCF)

Answer

Malaria

Answer

Disseminated Intravascular Coagulation (DIC)

Question 8

A child presents with Hb of 6.5 gm%, MCV of 65, MCH of 15, and protoporphyria with a much reduced red cell distribution width. What is the most likely diagnosis?

Accepted Answer

Iron deficiency anemia

Answer

Thalassemia

Answer

Porphyria

Answer

Megaloblastic anemia

Question 9

Which of the following is the most important prognostic factor in ALL?

Accepted Answer

Response to steroids

Answer

Hyperdiploidy

Answer

Total leukocyte count greater than 50,000

Answer

Age

Question 10

All of the following are true regarding the diagnosis of hemolytic anemia except:

Accepted Answer

Low lactate dehydrogenase (LDH) in the blood

Answer

Elevated unconjugated bilirubin in the blood

Answer

Haptoglobin levels are decreased

Answer

Direct Coombs test is positive

Hematopathology — MCQs

Hematopathology — MCQs

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