Hematopathology Practice Questions

Q: Which antibody class is primarily involved in Idiopathic Thrombocytopenic Purpura (ITP)?

IgG. **Explanation:** **Idiopathic Thrombocytopenic Purpura (ITP)**, now more commonly referred to as Immune Thrombocytopenic Purpura, is an acquired autoimmune disorder characterized by isolated thrombocytopenia [2]. **Why IgG is Correct:** The pathogenesis of ITP involves the production of **autoantibodies (predominantly of the IgG class)** directed against platelet surface antigens, most commonly the **GPIIb/IIIa** or **GPIb/IX** complexes. These IgG-coated platelets are recognized by the Fc receptors on splenic macrophages, leading to their premature sequestration and destruction in the **spleen**. **Why other options are incorrect:** * **IgM:** While IgM is the first antibody produced in a primary immune response and is involved in Cold Agglutinin Disease [1], it is not the primary mediator of platelet destruction in ITP. * **IgE:** This antibody class is associated with Type I hypersensitivity reactions (allergies, asthma) and parasitic infections, not autoimmune platelet destruction [2]. * **IgD:** Found on the surface of B-cells, its precise physiological function is less defined, but it plays no role in the pathogenesis of ITP. **High-Yield Clinical Pearls for NEET-PG:** * **Site of Destruction:** The **Spleen** is the primary site of both antibody production and platelet destruction in ITP. * **Bone Marrow Findings:** Characterized by **increased or normal megakaryocytes** (a compensatory response to peripheral destruction). * **First-line Treatment:** Corticosteroids (e.g., Prednisolone). In emergencies or prior to surgery, IVIG (Intravenous Immunoglobulin) is used to "clog" splenic Fc receptors [3]. * **Splenectomy:** Indicated in chronic/refractory cases as it removes the primary site of destruction.

Q: The HAM test is based upon which of the following?

Complement. **Explanation:** The **HAM Test** (Acidified Serum Lysis Test) was historically the gold standard for diagnosing **Paroxysmal Nocturnal Hemoglobinuria (PNH)**. **1. Why Complement is correct:** PNH is an acquired stem cell disorder characterized by a deficiency of **GPI-anchor proteins**, specifically **CD55** (Decay Accelerating Factor) and **CD59** (Membrane Inhibitor of Reactive Lysis). These proteins normally protect red blood cells (RBCs) from destruction by the body's own complement system. In the HAM test, the patient's RBCs are placed in acidified serum (pH 6.2). Acidification activates the **alternative complement pathway**; because PNH cells lack protective proteins, they undergo massive hemolysis. Thus, the test is fundamentally based on **complement-mediated lysis**. **2. Why other options are incorrect:** * **GPI Anchor Proteins:** While the *deficiency* of these proteins causes PNH, the HAM test itself measures the *result* of that deficiency (complement lysis), not the proteins directly. Modern diagnosis uses Flow Cytometry to detect the absence of these proteins. * **Spectrin protein:** Defects in spectrin are associated with **Hereditary Spherocytosis**, not PNH. * **Mannose-binding proteins:** These are involved in the lectin pathway of complement activation but are not the specific trigger or mechanism utilized in the HAM test. **Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Flow Cytometry (detecting absence of CD55/CD59) has replaced the HAM test. * **Sucrose Lysis Test:** Another screening test for PNH; it also relies on complement activation. * **Triad of PNH:** Hemolytic anemia, Pancytopenia, and Venous thrombosis (often in unusual sites like the Budd-Chiari syndrome). * **Treatment:** Eculizumab (a monoclonal antibody against C5 complement).

Q: Palatal edema is significant for which of the following conditions?

Gamma heavy chain disease. **Explanation:** Heavy chain diseases (HCDs) are rare B-cell proliferative disorders characterized by the production of monoclonal immunoglobulin heavy chains without associated light chains [1]. **Gamma Heavy Chain Disease (Franklin’s Disease):** This condition resembles a systemic lymphoma rather than multiple myeloma. A classic, high-yield clinical feature of Franklin’s disease is **palatal edema** (uvular edema). This occurs due to the infiltration of Waldeyer’s ring by malignant lymphoid cells, leading to lymphatic obstruction and swelling of the soft palate and uvula. This is a characteristic physical finding often tested in NEET-PG. **Analysis of Incorrect Options:** * **Alpha Heavy Chain Disease (Seligmann’s Disease):** This is the most common HCD. It primarily involves the gastrointestinal tract (immunoproliferative small intestinal disease - IPSID), presenting with malabsorption, chronic diarrhea, and abdominal pain. * **Mu Heavy Chain Disease:** This is the rarest form and is almost always associated with **Chronic Lymphocytic Leukemia (CLL)**. It typically presents with hepatosplenomegaly but lacks the characteristic palatal edema. * **Beta Heavy Chain Disease:** This does not exist as a clinical entity, as there is no "Beta" immunoglobulin heavy chain (the five types are Alpha, Gamma, Mu, Delta, and Epsilon). **High-Yield Clinical Pearls for NEET-PG:** * **Franklin’s Disease (Gamma):** Think "Palatal Edema" and systemic lymphadenopathy. * **Seligmann’s Disease (Alpha):** Think "Small Intestine" and "Malabsorption." * **Diagnosis:** HCDs are diagnosed via **immunofixation electrophoresis**, which shows a monoclonal band of heavy chains but a total absence of light chains (no Bence-Jones proteinuria). **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. 606-607.

Question 1

A four-year-old boy presented with a two-month history of abdominal pain and fever, a ten-day history of maculopapular rash, and a three-day history of dry cough, dyspnea, and wheezing. On examination, the liver and spleen were enlarged, measuring 4 cm and 3 cm, respectively, below the costal margins. His hemoglobin was 10.0 g/dL, platelet count was 37x10^9/L, and total leukocyte count was 70x10^9/L, with 80% eosinophils. Bone marrow examination revealed a cellular marrow comprising 45% blasts and 34% eosinophils and eosinophilic precursors. The blasts stained negative for myeloperoxidase and non-specific esterase and were positive for CD19, CD10, CD22, and CD20. Which of the following is the most likely diagnosis?

Accepted Answer

Acute lymphoblastic leukemia with hypereosinophilic syndrome

Answer

Biphenotypic acute leukemia (lymphoid and eosinophil lineage)

Answer

Acute eosinophilic leukemia

Answer

Acute myeloid leukemia with eosinophilia

Question 2

Which antibody class is primarily involved in Idiopathic Thrombocytopenic Purpura (ITP)?

Accepted Answer

IgG

Answer

IgM

Answer

IgE

Answer

IgD

Question 3

Which paraneoplastic syndrome is associated with Hodgkin's disease?

Accepted Answer

Cerebellar degenerative disease

Answer

Nephrotic syndrome

Answer

Retinopathy

Answer

Acanthosis nigricans

Question 4

Cabot's ring is seen in which of the following conditions?

Accepted Answer

Megaloblastic anemia

Answer

Sickle cell disease

Answer

Iron deficiency anemia

Answer

Autoimmune hemolytic anemia

Question 5

The HAM test is based upon which of the following?

Accepted Answer

Complement

Answer

GPI Anchor Proteins

Answer

Spectrin protein

Answer

Mannose binding proteins

Question 6

A four-year-old boy presented with a two-month history of abdominal pain and fever, a ten-day history of maculopapular rash, and a three-day history of dry cough, dyspnea, and wheezing. On examination, the liver and spleen were enlarged 4 cm and 3 cm below the costal margin, respectively. His hemoglobin was 10.0 g/dL, platelet count was 3.7 x 10^9/L, and total leukocyte count was 70 x 10^9/L, with 80% eosinophils. Bone marrow examination revealed a cellular marrow with 45% blasts and 34% eosinophils and eosinophil precursors. The blasts stained negative for myeloperoxidase and nonspecific esterase and were positive for CD19, CD10, CD22, and CD20. Which one of the following statements is not true about the disease?

Accepted Answer

Inv(16) is often detected in the blasts and the eosinophils.

Answer

Eosinophils are not part of the neoplastic clone.

Answer

t(5;14) rearrangement may be detected in blasts.

Answer

Peripheral blood eosinophilia may normalize with chemotherapy.

Question 7

Which one of the following is a pan T lymphocyte marker?

Accepted Answer

CD3

Answer

CD2

Answer

CD19

Answer

CD25

Question 8

Which of the following is considered a good prognostic feature in Hodgkin's disease?

Accepted Answer

Clinical stage

Answer

Histologic subtype

Answer

Age of the patient

Answer

Number of lymph nodes involved

Question 9

Palatal edema is significant for which of the following conditions?

Accepted Answer

Gamma heavy chain disease

Answer

Alpha heavy chain disease

Answer

Mu heavy chain disease

Answer

Beta heavy chain disease

Question 10

A patient presents with a mass at the duodenojejunal flexure that invades the renal papillae. Histopathology confirms the diagnosis as lymphoma. Which of the following staging classifications is most appropriate based on this information?

Accepted Answer

Ann Arbor Stage IV Extranodal

Answer

Ann Arbor Stage II Extranodal

Answer

Ann Arbor Stage I Extranodal

Answer

Staging cannot be done until bone marrow examination is performed

Hematopathology — MCQs

Hematopathology — MCQs

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