Hematopathology Practice Questions

Q: What is the value of the color index in microcytic hypochromic anemia associated with pregnancy?

Less than one. **Explanation:** The **Color Index (CI)** is an older hematological parameter that represents the relative hemoglobin content of a single red blood cell compared to a normal cell. It is calculated using the formula: $\text{Color Index} = \frac{ ext{Hemoglobin % of normal}}{\text{RBC count % of normal}}$ In modern practice, this has been largely replaced by **MCH (Mean Corpuscular Hemoglobin)**. **Why "Less than one" is correct:** Microcytic hypochromic anemia (most commonly **Iron Deficiency Anemia**) is the most frequent anemia seen in pregnancy due to increased fetal demand and expanded maternal plasma volume. In this condition, the reduction in hemoglobin is disproportionately greater than the reduction in the red cell count [1]. Since the numerator (Hb%) decreases more than the denominator (RBC%), the resulting value is **less than 1.0** (typically 0.6 to 0.8). **Analysis of Incorrect Options:** * **Option A (One):** A CI of 1.0 is seen in **Normocytic Normochromic anemia**, where Hb and RBC count decrease proportionately (e.g., acute blood loss or anemia of chronic disease). * **Option C (More than one):** A CI > 1.0 is characteristic of **Macrocytic anemias** (e.g., Megaloblastic anemia due to B12/Folate deficiency), where the large size of the RBC allows for a higher absolute hemoglobin content per cell. * **Option D (Three):** This is a physiologically impossible value for Color Index. **NEET-PG High-Yield Pearls:** 1. **Normal CI Range:** 0.85 to 1.15. 2. **Pregnancy Anemia:** Defined by the WHO as Hb **<11 g/dL**. 3. **MCHC vs. CI:** While CI measures hemoglobin per cell (like MCH), **MCHC** is the most specific indicator of hypochromia. 4. **Most common cause:** Iron deficiency is the #1 cause of microcytic hypochromic anemia in pregnancy worldwide [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 590-591.

Q: Burkitt's Lymphoma commonly affects which anatomical site?

Jaw. **Explanation:** Burkitt’s Lymphoma (BL) is a highly aggressive B-cell non-Hodgkin lymphoma characterized by the translocation of the **c-MYC gene** (typically t(8;14)). The anatomical presentation of BL varies significantly based on its clinical variant [1]: 1. **Endemic (African) Variant:** This is the classic form strongly associated with **Epstein-Barr Virus (EBV)**. It characteristically presents as a rapidly growing mass in the **mandible or maxilla (jaw)** in children [1]. This makes **Option A** the most common site associated with the classic description of the disease. 2. **Sporadic (Non-African) Variant:** This form is less associated with EBV and typically presents as an **abdominal mass**, most commonly involving the **ileocecal region** [1]. **Analysis of Incorrect Options:** * **B. Stomach:** While the sporadic form involves the abdomen, it primarily affects the distal ileum and cecum rather than the stomach (which is more common for MALTomas). * **C. Spleen:** Splenomegaly can occur, but the spleen is rarely the primary or defining site of presentation for BL. * **D. Kidneys:** Renal involvement can occur as part of systemic spread or in the sporadic form, but it is not the "classic" anatomical site used to identify the disease in exams [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Morphology:** Characterized by a **"Starry Sky" appearance** (tingible body macrophages representing the "stars" against a background of dark neoplastic B-cells). * **Immunophenotype:** Positive for CD19, CD20, CD10, and **BCL-6**; notably **BCL-2 negative**. * **Proliferation:** It has one of the highest proliferation rates (Ki-67 index often approaching **100%**). * **Genetics:** t(8;14) is most common; variants include t(2;8) and t(8;22). **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. 605-606.

Q: Auer rods are seen in which of the following cells?

Myeloblast. **Explanation:** **Auer rods** are pathognomonic morphological features of the **myeloid lineage** [1]. They are elongated, needle-like, pink or red-staining cytoplasmic inclusions formed by the fusion and crystallization of primary (azurophilic) granules [2]. 1. **Why Myeloblasts are correct:** Auer rods contain peroxidase, lysosomal enzymes, and crystalloid mucopolysaccharides. Since these granules are specific to the granulocytic series, Auer rods are found in **myeloblasts** and occasionally in promyelocytes (especially in APL) [1], [2]. Their presence definitively excludes a diagnosis of Acute Lymphoblastic Leukemia (ALL). 2. **Why other options are incorrect:** * **Lymphoblasts:** These cells belong to the lymphoid lineage, which lacks azurophilic granules and peroxidase; therefore, they never contain Auer rods [2]. * **Erythroblasts & Megakaryoblasts:** While these are part of the myeloid family (non-lymphoid), they do not typically form these specific crystalline inclusions. Auer rods are markers of **granulocytic differentiation** [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Acute Promyelocytic Leukemia (AML-M3):** Characterized by "faggot cells," which contain bundles or clusters of numerous Auer rods [2]. * **Staining:** Auer rods are strongly **Myeloperoxidase (MPO)** positive and **Sudan Black B** positive. * **Diagnostic Significance:** If you see an Auer rod, the diagnosis is **AML** (Acute Myeloid Leukemia) until proven otherwise [1]. They are never seen in Chronic Myeloid Leukemia (CML) unless it has entered a "myeloid blast crisis." **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. 620. [2] 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. 621-622.

Question 1

Cold agglutinins are directly against which of the following RBC antigens?

Accepted Answer

I antigen

Answer

P antigen

Answer

Le antigen

Answer

Rh antigen

Question 2

The 5-year survival rate is maximum in which of the following hematological malignancies?

Accepted Answer

Anaplastic large T cell lymphoma

Answer

Mantle cell lymphoma

Answer

Diffuse large B cell lymphoma

Answer

Burkitt's lymphoma

Question 3

Hereditary spherocytosis is caused by mutations in which of the following proteins?

Accepted Answer

All of the above

Answer

Ankyrin

Answer

Band 3

Answer

Spectrin

Question 4

Alder-Reilly bodies are seen in which of the following conditions?

Accepted Answer

Mucopolysaccharidosis

Answer

Langerhans cell histiocytosis

Answer

Alport syndrome

Answer

Chediak-Higashi syndrome

Question 5

What is the value of the color index in microcytic hypochromic anemia associated with pregnancy?

Accepted Answer

Less than one

Answer

One

Answer

More than one

Answer

Three

Question 6

Which of the following is the test for β-thalassemia trait?

Accepted Answer

HbA2

Answer

HbF

Answer

Fragility test

Answer

Coomb's test

Question 7

Burkitt's Lymphoma commonly affects which anatomical site?

Accepted Answer

Jaw

Answer

Stomach

Answer

Spleen

Answer

Kidneys

Question 8

In which condition is Thrombin time raised?

Accepted Answer

Afibrinogenemia

Answer

Hemophilia

Answer

Factor XII deficiency

Answer

von Willebrand's disease

Question 9

Auer rods are seen in which of the following cells?

Accepted Answer

Myeloblast

Answer

Lymphoblast

Answer

Erythroblast

Answer

Megakaryoblast

Question 10

All of the following stem cell populations are found within the bone marrow, except?

Accepted Answer

Myoblast Progenitor cells

Answer

Endothelial Progenitor cells

Answer

Mesenchymal stem cells

Answer

Hematopoietic stem cells

Hematopathology — MCQs

Hematopathology — MCQs

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