Hematopathology Practice Questions

Q: What is the condition characterized by a normal or decreased leukocyte count in the peripheral blood, yet still showing white blood cells?

Aleukemic Leukemia. ### Explanation The classification of leukemia based on peripheral blood findings is a high-yield topic for NEET-PG. The distinction between "Aleukemic" and "Subleukemic" leukemia depends on the total leukocyte count (TLC) and the presence of abnormal cells. **1. Why Aleukemic Leukemia is Correct:** **Aleukemic leukemia** is defined by two criteria: * The **Total Leukocyte Count (TLC)** is either normal or decreased (leukopenia). * **Abnormal/Blast cells are absent** or extremely rare in the peripheral blood smear. The diagnosis is made by examining the bone marrow, which will be hypercellular and packed with leukemic blasts. The question describes a scenario where the count is low/normal but the disease (leukemia) is present. **2. Why the Other Options are Incorrect:** * **Subleukemic Leukemia:** In this condition, the TLC is also low or normal (similar to aleukemic), but **abnormal/blast cells are visible** in the peripheral blood smear. * **Acute Leukemia:** This is a broad clinical category characterized by a rapid increase in immature blast cells. While it can present as aleukemic, most cases present with a high TLC (leukocytosis). * **Chronic Leukemia:** These typically present with significantly elevated TLC (often >100,000/µL) and a spectrum of maturing cells, not a low or normal count. **3. High-Yield Clinical Pearls for NEET-PG:** * **The "Dry Tap":** Aleukemic leukemia often presents with a "dry tap" on bone marrow aspiration due to intense marrow packing (hypercellularity), necessitating a bone marrow biopsy. * **Pancytopenia Differential:** Always consider aleukemic leukemia in the differential diagnosis of a patient presenting with pancytopenia (anemia, neutropenia, and thrombocytopenia). * **Terminology Tip:** * *Leukemic:* High TLC + Blasts in blood. * *Subleukemic:* Low/Normal TLC + Blasts in blood. * *Aleukemic:* Low/Normal TLC + **No** Blasts in blood.

Q: Retention of mature neutrophils in bone marrow is known as:

Myelokathesis. **Explanation:** **1. Why Myelokathesis is correct:** **Myelokathesis** (from the Greek *myelo* meaning marrow and *kathesis* meaning retention) is a rare congenital disorder characterized by severe chronic leukopenia and neutropenia. The underlying pathophysiology involves a mutation in the **CXCR4 receptor** gene. Normally, the interaction between CXCR4 on neutrophils and CXCL12 (SDF-1) in the bone marrow keeps precursors in the niche; a "gain-of-function" mutation causes excessive signaling, preventing mature neutrophils from exiting the marrow into the peripheral blood. On a bone marrow aspirate, this manifests as hypercellularity with an abundance of mature, often apoptotic-looking neutrophils (senescent changes like pyknotic nuclei and long filaments connecting nuclear lobes). **2. Why other options are incorrect:** * **Myelocytosis:** This is a general term referring to an increase in myeloid cells (specifically myelocytes) in the blood or bone marrow, often seen in leukemoid reactions or CML. * **Leukocytosis:** This refers to an elevated white blood cell count in the peripheral blood, which is the opposite of what occurs in myelokathesis. * **Leukemia:** This is a malignant proliferation of hematopoietic stem cells leading to the replacement of normal marrow with neoplastic cells (blasts or mature cells), not a retention defect of normal mature cells. **3. High-Yield Clinical Pearls for NEET-PG:** * **WHIM Syndrome:** Myelokathesis is a key component of the WHIM syndrome triad: **W**arts (HPV), **H**ypogammaglobulinemia, **I**nfections, and **M**yelokathesis. * **Genetics:** Look for **CXCR4** gene mutations in clinical vignettes. * **Morphology:** "Hypersegmented" or "pyknotic" neutrophils in a hypercellular marrow despite peripheral neutropenia is the classic diagnostic clue.

Q: Del(1;?) or D(1;?) translocation is common in which subtype of acute myeloid leukemia (AML)?

Promyelocytic (M3). **Acute Promyelocytic Leukemia (AML-M3)** is classically defined by the reciprocal translocation **t(15;17)(q22;q12)**, involving the *PML* and *RARA* genes [1]. However, cytogenetic studies have shown that **der(1) or del(1)**—specifically involving the long arm of chromosome 1—is a frequent **secondary chromosomal abnormality** found in M3. While t(15;17) is the primary driver, these additional changes on chromosome 1 are highly characteristic of the M3 subtype compared to other AMLs. **Analysis of Options:** * **Option B (Correct):** AML-M3 is the correct answer because del(1) or der(1) is a recognized recurrent secondary cytogenetic finding in this subtype. * **Option A (M5):** Monocytic leukemia is typically associated with abnormalities involving **11q23** (*KMT2A/MLL* gene) [1]. * **Option C (M6):** Erythroleukemia is often associated with complex karyotypes, frequently involving deletions of **chromosomes 5 and 7** (-5/del(5q) and -7/del(7q)). * **Option D (M7):** Megakaryocytic leukemia is most commonly associated with **t(1;22)(p13;q13)**, especially in infants, or trisomy 21 in Down Syndrome patients. **High-Yield Clinical Pearls for NEET-PG:** * **M3 Hallmark:** t(15;17) resulting in the *PML-RARA* fusion protein [1]. * **Morphology:** Presence of **Auer rods** (often in bundles called **Faggot cells**) [1]. * **Clinical Emergency:** High risk of **DIC (Disseminated Intravascular Coagulation)** due to the release of procoagulants from granules. * **Treatment:** Highly responsive to **ATRA** (All-trans retinoic acid) and Arsenic Trioxide, which induce differentiation of promyelocytes [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. 620-622.

Question 1

What is the condition characterized by a normal or decreased leukocyte count in the peripheral blood, yet still showing white blood cells?

Accepted Answer

Aleukemic Leukemia

Answer

Subleukemic leukemia

Answer

Acute leukemia

Answer

Chronic leukemia

Question 2

What is a condition characterized by a deficiency in globin synthesis?

Accepted Answer

Thalassemia

Answer

Sickle cell disease

Answer

Hereditary spherocytosis

Answer

None of these

Question 3

A patient's Prothrombin Time (PT) is 26 seconds, the control PT is 13 seconds, and the sensitivity index is 1.41. Calculate the patient's International Normalized Ratio (INR).

Accepted Answer

(26/13) ^ 1.41

Answer

26/13

Answer

(26/13) x 1.41

Answer

(26/13) + 1.41

Question 4

Which of the following findings are typically visualized using a Romanowsky stain?

Accepted Answer

Reticulocytes and Howell-Jolly bodies

Answer

Reticulocytes and Basophilic stippling

Answer

Basophilic stippling and Heinz bodies

Answer

Reticulocytes and Cabot rings

Question 5

Retention of mature neutrophils in bone marrow is known as:

Accepted Answer

Myelokathesis

Answer

Myelocytosis

Answer

Leukocytosis

Answer

Leukemia

Question 6

Histiocytic necrotizing lymphadenitis is:

Accepted Answer

Kikuchi disease

Answer

Kimura disease

Answer

Hodgkin's disease

Answer

Castleman's disease

Question 7

Del(1;?) or D(1;?) translocation is common in which subtype of acute myeloid leukemia (AML)?

Accepted Answer

Promyelocytic (M3)

Answer

Monocytic (M5)

Answer

Erythrocytic (M6)

Answer

Megakaryocytic (M7)

Question 8

What is the most common subtype of ALL (Acute Lymphoblastic Leukemia)?

Accepted Answer

Pre B cell ALL

Answer

Pre T cell ALL

Answer

T cell ALL

Answer

B cell ALL

Question 9

Which inherited coagulation defect is characterized by prolonged coagulation time?

Accepted Answer

All of the above

Answer

Protein C deficiency

Answer

Protein S deficiency

Answer

Antithrombin III deficiency

Question 10

Which of the following features characterize Hemolytic Uremic Syndrome?

Accepted Answer

Microangiopathic hemolytic anemia, Thrombocytopenia, Renal failure

Answer

Microangiopathic hemolytic anemia, decreased LDH, Thrombocytopenia

Answer

Microangiopathic hemolytic anemia, Renal failure

Answer

Decreased LDH, Thrombocytopenia, Renal failure

Hematopathology — MCQs

Hematopathology — MCQs

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