Hematopathology Practice Questions

Q: What is the finding seen in DIC?

Increased FDP, prolonged PT, reduced platelets. **Explanation:** Disseminated Intravascular Coagulation (DIC) is a **consumptive coagulopathy** characterized by the systemic activation of the coagulation cascade, leading to widespread microthrombi and subsequent depletion of clotting factors and platelets [1]. 1. **Why Option D is Correct:** * **Increased FDP (Fibrin Degradation Products):** As microthrombi form, the fibrinolytic system is activated to break them down, resulting in elevated FDPs and **D-dimers** (the most specific marker) [1]. * **Prolonged PT (Prothrombin Time):** Massive consumption of clotting factors (Factors V, VIII, and Prothrombin) leads to prolongation of PT, aPTT, and Thrombin Time [1]. * **Reduced Platelets:** Platelets are consumed during the formation of extensive systemic microthrombi, leading to thrombocytopenia [1]. 2. **Why Other Options are Incorrect:** * **Option A & B:** In DIC, **Fibrinogen** and **Antithrombin III** levels are **decreased**, not increased, because they are consumed during the uncontrolled clotting process [1]. * **Option C:** While FDP and Thrombin-Antithrombin complexes are increased, this option is less comprehensive than D for a clinical diagnosis. Furthermore, the hallmark of DIC is the "consumption" of cellular elements (platelets), making Option D the classic laboratory profile [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Peripheral Smear:** Look for **Schistocytes** (fragmented RBCs) due to microangiopathic hemolytic anemia (MAHA) [1]. * **Best Screening Test:** Platelet count (usually low) [1]. * **Most Specific Test:** D-dimer (indicates cross-linked fibrin degradation). * **Common Triggers:** Sepsis (Gram-negative), Obstetric complications (Abruptio placentae), and Malignancy (APML - M3 variant). **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 625-626.

Q: What are the cytogenetic abnormalities associated with lymphoplasmacytoid lymphoma?

t(9;14)(p13;q32). **Explanation:** **Lymphoplasmacytoid Lymphoma (LPL)**, often associated with **Waldenström Macroglobulinemia**, is a B-cell neoplasm characterized by the proliferation of small B lymphocytes, plasmacytoid lymphocytes, and plasma cells. [1] **Why Option A is correct:** The characteristic cytogenetic abnormality in LPL is **t(9;14)(p13;q32)**. This translocation involves the **PAX5 gene** on chromosome 9 and the **Immunoglobulin Heavy Chain (IgH) locus** on chromosome 14. This results in the overexpression of PAX5, a transcription factor essential for B-cell proliferation and differentiation, leading to the development of the lymphoma. **Analysis of Incorrect Options:** * **Option B: t(2;5)(p23;q35):** This is the hallmark of **Anaplastic Large Cell Lymphoma (ALCL)**, involving the *ALK* gene on chromosome 2 and the *NPM* gene on chromosome 5. * **Option C: t(11;14)(q13;q32):** This is diagnostic for **Mantle Cell Lymphoma**, leading to the overexpression of **Cyclin D1** (*PRAD1/BCL-1*). * **Option D: t(14;18)(q32;q21):** This is the classic translocation seen in **Follicular Lymphoma**, resulting in the overexpression of the anti-apoptotic protein **BCL-2**. **High-Yield Clinical Pearls for NEET-PG:** * **MYD88 L265P Mutation:** While t(9;14) is a known translocation, the **MYD88 L265P somatic mutation** is found in >90% of LPL cases and is a more frequent diagnostic marker in modern practice. * **Clinical Presentation:** Patients often present with **hyperviscosity syndrome** (due to monoclonal IgM paraprotein), hepatosplenomegaly, and lymphadenopathy. [1] * **Dutcher Bodies:** Look for PAS-positive intranuclear inclusions (Dutcher bodies) in malignant cells, which are highly suggestive of LPL. **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. 609-610.

Q: Transformation of chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL) into diffuse large B-cell lymphoma (DLBCL) is called?

Richter syndrome. ### Explanation **Correct Option: A. Richter Syndrome** Richter syndrome (or Richter transformation) refers to the sudden progression of **Chronic Lymphocytic Leukemia/Small Lymphocytic Lymphoma (CLL/SLL)** into a more aggressive high-grade non-Hodgkin lymphoma [1], most commonly **Diffuse Large B-cell Lymphoma (DLBCL)** (approx. 90-95%) or rarely Hodgkin Lymphoma. Clinically, it is characterized by a rapid increase in lymph node size, worsening systemic symptoms (B-symptoms), and a poor prognosis. **Incorrect Options:** * **B. Evans Syndrome:** An autoimmune condition defined by the simultaneous or sequential occurrence of Immune Thrombocytopenic Purpura (ITP) and Autoimmune Hemolytic Anemia (AIHA). While it can occur in CLL patients [1], it is not a transformation into a high-grade lymphoma. * **C. Li-Fraumeni Syndrome:** A cancer predisposition syndrome caused by germline mutations in the **TP53** tumor suppressor gene, leading to various early-onset cancers (SBLA syndrome: Sarcoma, Breast, Leukemia, Adrenal). * **D. Kostmann Syndrome:** Also known as Severe Congenital Neutropenia, it is an autosomal recessive disorder characterized by a maturation arrest of neutrophil precursors in the bone marrow. **High-Yield Clinical Pearls for NEET-PG:** * **Incidence:** Occurs in approximately 2–10% of CLL patients. * **Genetic Marker:** Often associated with **NOTCH1** mutations, TP53 disruptions, and CDKN2A deletions. * **Diagnosis:** PET-CT is useful to identify the site of transformation (high SUV uptake), but **Excisional Lymph Node Biopsy** is the gold standard. * **Morphology:** Look for large cells with prominent nucleoli (centroblasts/immunoblasts) replacing the previous small lymphocyte architecture. **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. 602.

Q: Which CD marker is specific for the myeloid series?

CD117. **CD117 (c-kit)** is a transmembrane tyrosine kinase receptor that is highly expressed on hematopoietic stem cells and committed myeloid progenitors. In the context of hematopathology, it is considered a **specific marker for the myeloid series**, particularly in the diagnosis of **Acute Myeloid Leukemia (AML)**. While it is also found on mast cells and interstitial cells of Cajal, its presence in a blast population strongly indicates myeloid differentiation [1]. **Analysis of Incorrect Options:** * **CD34:** This is a marker of **hematopoietic stem cells (HSCs)** and primitive progenitors. It is not lineage-specific, as it is expressed in both lymphoblasts (ALL) and myeloblasts (AML). * **CD45:** Known as the **Leukocyte Common Antigen (LCA)**, it is expressed on almost all white blood cells. It is a pan-leukocyte marker, not specific to the myeloid series. * **CD99:** This marker is classically associated with **Ewing sarcoma/PNET**. In hematology, it can be expressed in T-cell lymphoblastic lymphoma, but it lacks specificity for myeloid cells. **Clinical Pearls for NEET-PG:** * **MPO (Myeloperoxidase):** The most specific gold-standard marker for myeloid differentiation (detected via cytochemistry or IHC). * **CD13 & CD33:** Other common pan-myeloid markers used in flow cytometry [2]. * **CD117 & GIST:** Beyond AML, CD117 is the diagnostic marker for **Gastrointestinal Stromar Tumors (GIST)**, where it serves as a target for Imatinib therapy. * **Systemic Mastocytosis:** CD117 is also a key marker for identifying neoplastic mast cells [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. 620-625. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 609-611.

Q: What is the anticoagulant of choice for the Wintrobe method of ESR determination?

Heparin. **Explanation:** The **Wintrobe method** is a traditional technique used to determine the Erythrocyte Sedimentation Rate (ESR) and Packed Cell Volume (PCV). The anticoagulant of choice for this method is **Heparin** (specifically ammonium heparin or balanced heparin), as it does not alter the size or shape of the red blood cells, ensuring accurate sedimentation and volume measurement. **Analysis of Options:** * **Heparin (Correct):** It acts by activating antithrombin III. It is preferred in the Wintrobe method because it prevents hemolysis and does not cause shrinkage or swelling of erythrocytes, which is critical for the simultaneous measurement of PCV. * **Citrate (Incorrect):** Sodium citrate (3.8%) is the anticoagulant of choice for the **Westergren method** (the gold standard for ESR). It is used in a 1:4 ratio. Using it in the Wintrobe method would dilute the sample significantly, leading to inaccurate results. * **Oxalate (Incorrect):** While "Double Oxalate" (Wintrobe’s mixture) was historically used, it is less preferred today because potassium oxalate can cause RBC shrinkage, potentially affecting the ESR and PCV readings. * **EDTA (Incorrect):** While EDTA is the standard for routine hematology (CBC), it is not the traditional choice for the Wintrobe method as it can lead to cell shrinkage over time, falsely increasing the ESR. **High-Yield Clinical Pearls for NEET-PG:** * **Wintrobe Tube:** 110 mm long, 3 mm bore. It measures both ESR (0–100 mm) and PCV (0–100%). * **Westergren Tube:** 300 mm long, 2.5 mm bore. It is more sensitive for ESR because of the greater column height. * **Ratio:** Westergren uses 4 parts blood to 1 part citrate; Wintrobe uses undiluted heparinized blood. * **Fact:** ESR is a non-specific marker of inflammation, primarily driven by **Fibrinogen** (the most potent pro-sedimentation factor).

Q: In anemia due to lead poisoning, what will the bone marrow characteristically show?

Basophilic stippling. **Explanation:** **Correct Answer: D. Basophilic stippling** Lead poisoning (Plumbism) interferes with the activity of the enzyme **5'-nucleotidase**, which is responsible for the degradation of ribosomal RNA. This inhibition leads to the persistence of ribosomal RNA aggregates within the cytoplasm of erythrocytes, appearing as fine, blue granules known as **basophilic stippling**. While this is classically seen in the peripheral smear, it is a characteristic finding in the erythroid precursors of the bone marrow in lead-affected erythropoiesis. **Analysis of Incorrect Options:** * **A. Dwarf megakaryocyte (Micromegakaryocyte):** These are characteristic of **Myelodysplastic Syndromes (MDS)** and certain types of Myeloid Leukemias. They are not associated with lead toxicity. * **B. Ring sideroblasts:** While lead poisoning inhibits ferrochelatase (leading to iron accumulation in mitochondria), **Ring sideroblasts** are the hallmark of **Sideroblastic Anemia**. In the context of NEET-PG, if both are options, Basophilic Stippling is the more "characteristic" morphological finding for lead, whereas Ring Sideroblasts are more specific to MDS (RARS) or hereditary sideroblastic anemia. * **C. Pelger-Huet anomaly:** This refers to hyposegmented neutrophils (pince-nez appearance). It is seen in **MDS (Pseudo-Pelger Huet)** or as a benign autosomal dominant condition. **Clinical Pearls for NEET-PG:** * **Enzymes inhibited by Lead:** δ-aminolevulinic acid dehydratase (ALA-D) and Ferrochelatase. * **Clinical Signs:** Burtonian lines (lead lines on gums), wrist drop/foot drop (peripheral neuropathy), and colic [1]. * **Radiology:** "Lead lines" at the metaphysis of long bones in children [1]. * **Treatment:** Chelation therapy with Succimer (oral), Ca-EDTA, or British Anti-Lewisite (BAL). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, pp. 418-419.

Question 1

Hemoglobinuria may be seen in all of the following conditions EXCEPT?

Accepted Answer

Hereditary spherocytosis

Answer

Mismatched blood transfusion

Answer

Paroxysmal cold hemoglobinuria

Answer

Thermal burns

Question 2

What is the finding seen in DIC?

Accepted Answer

Increased FDP, prolonged PT, reduced platelets

Answer

Increased fibrinogen, increased antithrombin III, increased thrombin-antithrombin III complexes

Answer

Increased FDP, decreased PT, increased antithrombin III

Answer

Increased FDP, prolonged PT, increased thrombin-antithrombin complexes

Question 3

What are the cytogenetic abnormalities associated with lymphoplasmacytoid lymphoma?

Accepted Answer

t(9;14)(p13;q32)

Answer

t(2;5)(p23;q35)

Answer

t(11;14)(q13;q32)

Answer

t(14;18)(q32;q21)

Question 4

Transformation of chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL) into diffuse large B-cell lymphoma (DLBCL) is called?

Accepted Answer

Richter syndrome

Answer

Evans syndrome

Answer

Li Fraumeni syndrome

Answer

Kostmann syndrome

Question 5

Which CD marker is specific for the myeloid series?

Accepted Answer

CD117

Answer

CD34

Answer

CD45

Answer

CD99

Question 6

Absolute monocytosis is seen in which of the following conditions?

Accepted Answer

All of the above

Answer

Brucellosis

Answer

Kala-azar

Answer

Tuberculosis

Question 7

What is the anticoagulant of choice for the Wintrobe method of ESR determination?

Accepted Answer

Heparin

Answer

Citrate

Answer

Oxalate

Answer

EDTA

Question 8

In anemia due to lead poisoning, what will the bone marrow characteristically show?

Accepted Answer

Basophilic stippling

Answer

Dwarf megakaryocyte

Answer

Ring sideroblasts

Answer

Pelger-Huet anomaly

Question 9

A 25-year-old asymptomatic female underwent a preoperative coagulation test. Her bleeding time (BT) is 3 minutes, prothrombin time (PT) is 15/14 seconds, activated partial thromboplastin time (aPTT) is 45/35 seconds, platelet count is 2.5 lac/mm3, and factor VIII levels were 60 IU/dL. She most likely has:

Accepted Answer

Factor VIII inhibitors

Answer

Factor IX deficiency

Answer

Von-Willebrands disease type III

Answer

Lupus anticoagulant

Question 10

All the following cause extravascular hemolysis except?

Accepted Answer

Blood transfusion reaction

Answer

Hereditary spherocytosis

Answer

Thalassemia

Answer

Autoimmune hemolytic anemia

Hematopathology — MCQs

Hematopathology — MCQs

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