Hematopathology Practice Questions

Q: Factor X deficiency is seen in which of the following?

None of the above. **Explanation:** The correct answer is **D. None of the above**. This question tests your fundamental knowledge of the coagulation cascade and the specific factor deficiencies associated with the Hemophilias. **1. Why "None of the above" is correct:** Factor X (Stuart-Prower factor) deficiency is a rare autosomal recessive bleeding disorder. It is distinct from Hemophilia A and B. Factor X is the first factor in the **Common Pathway** [2]; therefore, its deficiency results in the prolongation of both Prothrombin Time (PT) and Activated Partial Torrential Thromboplastin Time (aPTT). **2. Why the other options are incorrect:** * **Hemophilia A (Option A):** This is an X-linked recessive disorder caused by a deficiency of **Factor VIII**. It affects the intrinsic pathway, leading to a prolonged aPTT but a normal PT. * **Hemophilia B (Option B):** Also known as Christmas Disease, this is an X-linked recessive disorder caused by a deficiency of **Factor IX**. Like Hemophilia A, it results in a prolonged aPTT with a normal PT. **High-Yield Clinical Pearls for NEET-PG:** * **Hemophilia C:** Caused by a deficiency of **Factor XI** (Autosomal recessive, common in Ashkenazi Jews). * **Parahemophilia:** Caused by a deficiency of **Factor V**. * **Vitamin K Dependent Factors:** Factors II, VII, IX, and X (and Proteins C and S) [1]. Note that while Factor X is Vitamin K dependent, its primary deficiency is not called "Hemophilia." * **Mixing Studies:** If aPTT corrects with normal plasma, it indicates a factor deficiency (like Hemophilia); if it does not correct, it suggests the presence of an inhibitor (like Lupus anticoagulant). **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 582-583. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, pp. 128-130.

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.

Q: Which one of the following is the most common immunologic type of multiple myeloma?

IgG, Kappa light chain. **Explanation:** Multiple myeloma is a neoplastic proliferation of plasma cells that secrete a monoclonal (M) protein [1]. The classification of myeloma is based on the type of heavy chain and light chain produced. **1. Why Option A is Correct:** The most common heavy chain produced in multiple myeloma is **IgG** (found in approximately 50–60% of cases), followed by IgA [1]. Regarding light chains, **Kappa (κ)** is more common than Lambda (λ), occurring in a ratio of approximately 2:1. Therefore, **IgG-Kappa** is the most frequent immunologic subtype encountered in clinical practice. **2. Analysis of Incorrect Options:** * **Option B (IgA, Kappa):** This is the second most common heavy chain type (approx. 20–25% of cases) [1]. While common, it is significantly less frequent than the IgG type. * **Option C (IgD, Lambda):** IgD myeloma is rare (less than 2%) [1]. Interestingly, IgD myeloma is a unique exception where **Lambda** light chains are more common than Kappa, but it remains an uncommon subtype overall. * **Option D (IgM type):** IgM production is characteristic of **Waldenström Macroglobulinemia**, not Multiple Myeloma [1]. True IgM myeloma is extremely rare. **High-Yield Clinical Pearls for NEET-PG:** * **Bence-Jones Proteins:** These represent free light chains excreted in the urine [1]. * **M-Spike:** On Serum Protein Electrophoresis (SPEP), the monoclonal protein typically appears as a sharp spike in the **gamma-globulin** region. * **CRAB Criteria:** Remember the classic presentation: **C**alcium elevation, **R**enal insufficiency, **A**nemia, and **B**one lesions (lytic "punched-out" lesions). * **Diagnosis:** Plasma cells >10% on bone marrow biopsy is a key diagnostic criterion. **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. 608-609.

Q: Which CD marker is characteristic of histiocytosis?

CD1a. **Explanation:** **Langerhans Cell Histiocytosis (LCH)** is a proliferative disorder of Langerhans cells, which are specialized dendritic cells [1]. The diagnosis relies on identifying specific immunophenotypic markers and ultrastructural features. **Why CD1a is correct:** CD1a is a highly specific cell surface marker for Langerhans cells. It is a non-classical MHC class I-like molecule involved in presenting lipid antigens to T-cells. In the context of histiocytosis, **CD1a** (along with **S100** and **Langerin/CD207**) is the gold standard diagnostic marker used in immunohistochemistry to confirm LCH. **Why other options are incorrect:** * **CD1b, CD1c, and CD1d:** While these belong to the same family of antigen-presenting molecules as CD1a, they are not used diagnostically for histiocytosis. CD1b and CD1c are expressed on various subsets of dendritic cells and B-cells, while CD1d is primarily involved in presenting lipids to Natural Killer T (NKT) cells. They lack the diagnostic specificity required for LCH. **High-Yield Clinical Pearls for NEET-PG:** * **Electron Microscopy:** The pathognomonic finding is the **Birbeck Granule**, which has a characteristic "tennis racket" appearance [1]. * **Langerin (CD207):** This is the most specific marker for LCH as it is directly associated with the formation of Birbeck granules [1]. * **Genetics:** Over 50% of LCH cases harbor the **BRAF V600E mutation**, which has led to the use of BRAF inhibitors in refractory cases [1]. * **Clinical Triad (Hand-Schüller-Christian disease):** Calvarial bone defects, exophthalmos, and diabetes insipidus. **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.

Question 1

Factor X deficiency is seen in which of the following?

Accepted Answer

None of the above

Answer

Hemophilia A

Answer

Hemophilia B

Answer

Both

Question 2

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 3

Disseminated Intravascular Coagulation (DIC) is common in which subtype of Acute Myeloid Leukemia (AML)?

Accepted Answer

Acute Promyelocytic Leukemia (M3)

Answer

Acute Monocytic Leukemia (M5)

Answer

Acute Erythrocytic Leukemia (M6)

Answer

Acute Megakaryocytic Leukemia (M7)

Question 4

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 5

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

Question 6

Spherocytosis is seen in which of the following conditions?

Accepted Answer

Hereditary elliptocytosis

Answer

Hemoglobin C

Answer

Mechanical trauma

Answer

Hereditary spherocytosis

Question 7

Which one of the following is the most common immunologic type of multiple myeloma?

Accepted Answer

IgG, Kappa light chain

Answer

IgA, Kappa light chain

Answer

IgD, Lambda light chain

Answer

IgM, type

Question 8

Which of the following is associated with an intrinsic defect in the RBC membrane?

Accepted Answer

Hereditary spherocytosis

Answer

Autoimmune hemolytic anemia

Answer

Microangiopathic hemolytic anemia

Answer

Thermal injury anemia

Question 9

Which CD marker is characteristic of histiocytosis?

Accepted Answer

CD1a

Answer

CD1b

Answer

CD1c

Answer

CD1d

Question 10

Massive transfusions result in which of the following complications?

Accepted Answer

Disseminated intravascular coagulation (DIC), Hypothermia, Hypercalcemia

Answer

Disseminated intravascular coagulation (DIC), Hypothermia, Thrombocytopenia

Answer

Disseminated intravascular coagulation (DIC), Hypercalcemia, Thrombocytopenia

Answer

Hypothermia, Hypercalcemia, Thrombocytopenia

Hematopathology — MCQs

Hematopathology — MCQs

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