Hematopathology Practice Questions

Q: The "Owl's eye" nucleus is a characteristic finding in which type of lymphoma?

Hodgkin's lymphoma. **Explanation:** The "Owl’s eye" appearance is the hallmark morphological feature of the **classic Reed-Sternberg (RS) cell**, which is diagnostic for **Hodgkin’s Lymphoma** [1]. These are large, multinucleated or bilobed cells where each lobe contains a prominent, eosinophilic, inclusion-like nucleolus surrounded by a clear halo, mimicking the eyes of an owl [1]. **Why the other options are incorrect:** * **Non-Hodgkin’s Lymphoma (NHL):** This is a diverse group of malignancies (e.g., Follicular, DLBCL) that typically lack RS cells [1]. They are characterized by a diffuse or nodular proliferation of lymphoid cells without the specific "Owl's eye" morphology. * **Burkitt’s Lymphoma:** This is characterized by a **"Starry sky" appearance** on low power, created by tingible body macrophages (the "stars") consuming apoptotic debris against a background of dark neoplastic B-cells (the "sky"). * **Cutaneous T-cell Lymphoma (Mycosis Fungoides):** This is characterized by **Pautrier’s microabscesses** in the epidermis and "Cerebriform" nuclei (Sezary cells) in the peripheral blood. **High-Yield Clinical Pearls for NEET-PG:** * **Immunophenotype:** Classic RS cells are typically **CD15+ and CD30+**, but negative for CD45 and CD20 (except in the Nodular Lymphocyte Predominant subtype, which is CD20+ and CD45+). * **Variants:** The "Lacunar variant" is specifically associated with the **Nodular Sclerosis** subtype of Hodgkin's Lymphoma [1]. * **Bimodal Age Distribution:** Hodgkin’s Lymphoma typically shows two peaks of incidence (20s and 50s) [1]. * **EBV Association:** The Mixed Cellularity subtype has the strongest association with the Epstein-Barr Virus [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. 614-618.

Q: Reticulocytosis is NOT a feature of which of the following conditions?

Anemia in chronic renal failure. ### Explanation The **Reticulocyte Count** is a direct indicator of the bone marrow's erythropoietic activity. To have reticulocytosis (an increase in young RBCs), two conditions must be met: a functional bone marrow and adequate levels of **Erythropoietin (EPO)**. [1] **Why Option D is Correct:** In **Chronic Renal Failure (CRF)**, the primary cause of anemia is the **deficiency of Erythropoietin**, which is produced by the peritubular interstitial cells of the kidney. [1] Without EPO, the bone marrow is not stimulated to produce RBCs despite the anemia. Therefore, CRF is characterized by a **low reticulocyte count** (hypoproliferative anemia). **Why Other Options are Incorrect:** * **Paroxysmal Nocturnal Hemoglobinuria (PNH) & Hereditary Spherocytosis:** Both are hemolytic anemias. In hemolysis, the bone marrow is healthy and responds to the low hemoglobin by increasing RBC production, leading to significant **reticulocytosis**. * **Following Acute Bleeding:** After a sudden loss of blood, the body compensates by releasing EPO to stimulate the marrow. [1] Within 3–5 days, the reticulocyte count rises as the marrow attempts to replace the lost volume. ### High-Yield Clinical Pearls for NEET-PG * **Corrected Reticulocyte Count (CRC):** In anemia, always use CRC to assess marrow response. $CRC = \text{Observed Retic \%} \times (\text{Patient's Hct} / \text{Normal Hct})$. * **Reticulocyte Production Index (RPI):** An **RPI > 2%** indicates an adequate marrow response (hemolysis/hemorrhage), while **RPI < 2%** indicates an inadequate response (nutritional deficiencies or marrow failure). * **Anemia in CRF:** Usually Normocytic Normochromic. Treatment involves recombinant human erythropoietin (target Hb: 10–12 g/dL). * **Other causes of low reticulocyte count:** Aplastic anemia, Iron/B12/Folate deficiency, and Bone marrow suppression (chemotherapy). [1]

Q: The presence of Heinz bodies in erythrocytes indicates which of the following?

Oxidative stress. **Explanation:** Heinz bodies are inclusions within red blood cells (RBCs) composed of **denatured, precipitated hemoglobin**. The primary mechanism behind their formation is **oxidative stress**. When RBCs are exposed to oxidative damage (often due to drugs like dapsone, fava beans, or infections), the sulfhydryl groups on the globin chains are oxidized, causing the hemoglobin to lose its solubility and precipitate [1]. This is most commonly seen in **G6PD deficiency**, where the lack of NADPH prevents the regeneration of reduced glutathione, leaving the cell vulnerable to oxidative injury [1]. **Analysis of Options:** * **Option A (Malarial infection):** Malaria is characterized by intracellular parasites (ring forms, gametocytes) or Schüffner’s dots, not precipitated hemoglobin. * **Option B (Hemoglobin abnormalities):** While certain unstable hemoglobins (e.g., Hb Cologne) can cause Heinz bodies, "Oxidative stress" is the more fundamental physiological process that triggers the precipitation. * **Option D (Degraded bacterial forms):** Bacteria do not form intra-erythrocytic inclusions like Heinz bodies. **NEET-PG High-Yield Pearls:** 1. **Staining:** Heinz bodies are **not visible on routine Leishman or Wright-Giemsa stains**. they require **Supravital stains** (e.g., Crystal Violet, Brilliant Cresyl Blue, or Methylene Blue). 2. **Bite Cells (Degmacytes):** When RBCs containing Heinz bodies pass through the splenic sinusoids, splenic macrophages pluck out the inclusions, resulting in "Bite cells" seen on peripheral smears [1]. 3. **Differential:** Do not confuse Heinz bodies with **Howell-Jolly bodies** (DNA remnants seen in hyposplenism) or **Pappenheimer bodies** (iron granules seen in sideroblastic anemia). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 642-643.

Question 1

The "Owl's eye" nucleus is a characteristic finding in which type of lymphoma?

Accepted Answer

Hodgkin's lymphoma

Answer

Non-Hodgkin's lymphoma

Answer

Burkitt's lymphoma

Answer

Cutaneous T-cell lymphoma

Question 2

Reticulocytosis is NOT a feature of which of the following conditions?

Accepted Answer

Anemia in chronic renal failure

Answer

Paroxysmal nocturnal hemoglobinuria

Answer

Following acute bleeding

Answer

Hereditary spherocytosis

Question 3

Flame cells are characteristic of which of the following conditions?

Accepted Answer

Multiple myeloma

Answer

Ewing's sarcoma

Answer

Leukemia

Answer

Osteosarcoma

Question 4

A 63-year-old man has noticed a lump in his neck for 2 months. Examination reveals a group of three discrete nontender right posterior cervical lymph nodes, and a mass of enlarged right axillary lymph nodes. Chest and abdominal CT scans show mediastinal lymphadenopathy and hepatosplenomegaly. Microscopic examination of a cervical lymph node biopsy reveals abundant large CD15+ and CD30+ binucleate cells with prominent acidophilic nucleoli, scattered within a sparse lymphocytic infiltrate. What is molecular analysis of this lesion most likely to reveal?

Accepted Answer

Clonal Epstein-Barr virus (EBV) integration in the large cells

Answer

BCL6 gene rearrangements in the large cells

Answer

Deletions of 5q in all the cells

Answer

Helicobacter pylori infection in all the cells

Question 5

Hemolytic anemia is a feature of deficiency of all RBC enzymes EXCEPT?

Accepted Answer

Lactate dehydrogenase

Answer

Glucose 6 phosphate dehydrogenase

Answer

Pyruvate kinase

Answer

Aldolase A

Question 6

Which staining technique is used to detect coarse basophilic stippling?

Accepted Answer

Coarse basophilic stippling

Answer

Peripheral blood reticulocytes

Answer

Heinz bodies

Answer

Globin chain inclusions in severe thalassemia

Question 7

The presence of Heinz bodies in erythrocytes indicates which of the following?

Accepted Answer

Oxidative stress

Answer

Malarial infection

Answer

Hemoglobin abnormalities

Answer

Degraded bacterial forms

Question 8

What is the most common type of heavy chain disease?

Accepted Answer

Alpha chain disease

Answer

Gamma chain disease

Answer

Mu chain disease

Answer

Delta chain disease

Question 9

In which of the following conditions does the Periodic Acid-Schiff (PAS) test show block positivity?

Accepted Answer

Acute lymphoblastic leukemia (ALL)

Answer

Acute myeloid leukemia (AML)

Answer

Chronic myeloid leukemia (CML)

Answer

Hodgkin's lymphoma

Question 10

What is the most common type of Hodgkin's lymphoma?

Accepted Answer

Nodular sclerosis

Answer

Lymphocyte predominant

Answer

Lymphocyte depletion

Answer

Mixed cellularity

Hematopathology — MCQs

Hematopathology — MCQs

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