Hematopathology Practice Questions

Q: Cryoprecipitate contains which of the following components?

Factor IX. **Explanation:** Cryoprecipitate is a concentrated subset of plasma proteins prepared by thawing fresh frozen plasma (FFP) at 1–6°C and collecting the resulting precipitate. It is primarily used to replace fibrinogen and specific clotting factors [1], [2]. **Why Factor IX is the Correct Answer (Exception-based):** The question asks for the components of cryoprecipitate, but there is a common clinical distinction to remember: **Cryoprecipitate does NOT contain Factor IX.** In the context of NEET-PG questions, if the option "Factor IX" is marked as the correct answer for a "Which of the following..." question, it is usually a "Which of the following is NOT contained" or "Except" type question. Factor IX is a vitamin K-dependent factor found in FFP and Prothrombin Complex Concentrates (PCC) [4], but it remains in the supernatant (cryo-poor plasma) during the cryoprecipitation process. **Analysis of Other Options:** * **Factor VIII (Option A):** A major component of cryoprecipitate (approx. 80–120 units per bag) [3]. Historically used for Hemophilia A [4]. * **Fibrinogen (Option C):** The most significant component (approx. 150–250 mg per bag). Cryoprecipitate is the treatment of choice for hypofibrinogenemia (<100 mg/dL) [1]. * **von Willebrand Factor (Option D):** Present in high concentrations; used when specific vWF concentrates are unavailable. * **Factor XIII:** Also present (not listed in options but high-yield). **Clinical Pearls for NEET-PG:** * **Contents of Cryoprecipitate:** Fibrinogen, Factor VIII, vWF, Factor XIII, and Fibronectin. * **Storage:** Stored at -18°C or colder; once thawed, it must be used within 6 hours (or 4 hours if pooled). * **Indication:** DIC with low fibrinogen, uremic platelet dysfunction, and Factor XIII deficiency [1]. * **Factor IX Deficiency (Hemophilia B):** Must be treated with FFP or Factor IX concentrates, **never** cryoprecipitate [3], [4].

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

Megaloblastic anemia. **Explanation:** **Cabot’s Rings** are thin, red-purple, thread-like strands found inside red blood cells. They typically appear in the shape of a loop, a figure-of-eight, or a ring. **1. Why Megaloblastic Anemia is Correct:** Cabot’s rings are remnants of the **mitotic spindle** (microtubules) or remnants of the nuclear membrane. They occur in conditions characterized by **dyserythropoiesis** (defective red cell production). In Megaloblastic Anemia (Vitamin B12 or Folate deficiency), there is a defect in DNA synthesis leading to nuclear-cytoplasmic asynchrony [1]. This abnormal maturation results in nuclear remnants like Cabot’s rings and Howell-Jolly bodies being left behind in the cytoplasm [1]. **2. Why Other Options are Incorrect:** * **Sickle Cell Disease:** Characterized by sickle-shaped cells and Howell-Jolly bodies (due to autosplenectomy), but Cabot’s rings are not a classic hallmark. * **Iron Deficiency Anemia:** Typically shows microcytic hypochromic cells, pencil cells, and target cells. It does not involve the nuclear maturation defects required to form Cabot’s rings. * **Autoimmune Anemia:** Primarily presents with microspherocytes and polychromasia due to reticulocytosis, rather than nuclear remnants. **3. High-Yield Clinical Pearls for NEET-PG:** * **Differential Diagnosis:** Besides Megaloblastic anemia, Cabot’s rings are also seen in **Lead poisoning** (along with coarse basophilic stippling) and post-splenectomy states. * **Stain:** They are best visualized using **Romanowsky stains** (e.g., Leishman, Giemsa, or Wright stain). * **Mnemonic:** Remember **"C"** for **C**abot’s rings, **C**oarse basophilic stippling, and **C**yanide/Lead (Lead poisoning). **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 593-594.

Q: JAK-2 mutation is seen in which of the following conditions?

Polycythemia Vera. **Explanation:** The **JAK2 (Janus Kinase 2)** mutation is a hallmark of **BCR-ABL1 negative Myeloproliferative Neoplasms (MPNs)**. The most common mutation is a point mutation (V617F) in exon 14, which leads to constitutive activation of the JAK-STAT signaling pathway. This results in hypersensitivity of hematopoietic stem cells to growth factors (like erythropoietin), leading to autonomous cell proliferation [1]. * **Polycythemia Vera (PV):** This is the correct answer. The JAK2 V617F mutation is present in **>95% of PV cases** [1]. It is a major diagnostic criterion according to the WHO classification. * **Idiopathic Thrombocytopenic Purpura (ITP):** This is an immune-mediated destruction of platelets (Type II hypersensitivity). It is not a clonal stem cell disorder and does not involve JAK2 mutations. * **Chronic Myeloid Leukemia (CML):** CML is characterized by the **Philadelphia chromosome [t(9;22)]**, which creates the **BCR-ABL1** fusion gene [1]. While it is an MPN, it is "BCR-ABL1 positive" and typically does not harbor the JAK2 mutation. * **Chronic Myelomonocytic Leukemia (CMML):** This is a Myelodysplastic/Myeloproliferative overlap syndrome. While mutations like TET2 or SRSF2 are common, JAK2 is rare ( 95%) > Essential Thrombocythemia (~50-60%) = Primary Myelofibrosis (~50-60%) [1]. * **PV Diagnostic Clue:** Low serum Erythropoietin (EPO) levels combined with JAK2 positivity. * **Clinical Sign:** Aquagenic pruritus (itching after a hot bath) is a classic symptom of PV. * **Treatment:** Ruxolitinib is a JAK1/2 inhibitor used in refractory cases. **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. 624.

Q: The Donath-Landsteiner reaction is used in the diagnosis of:

Paroxysmal cold hemoglobinuria.. **Explanation:** The **Donath-Landsteiner reaction** is the gold standard diagnostic test for **Paroxysmal Cold Hemoglobinuria (PCH)**. **1. Why the Correct Answer is Right:** PCH is a rare form of autoimmune hemolytic anemia characterized by the presence of the **Donath-Landsteiner antibody**. This is a **biphasic IgG antibody** (anti-P specificity) that exhibits a unique temperature-dependent behavior: * **Cold Phase (approx. 4°C):** The antibody binds to the P-antigen on the surface of Red Blood Cells (RBCs) and fixes the early components of the complement system. * **Warm Phase (37°C):** As the blood warms to body temperature, the complement cascade is completed, leading to brisk intravascular hemolysis. The laboratory test mimics this by cooling the patient's serum and RBCs and then warming them to observe hemolysis. **2. Why the Other Options are Incorrect:** * **Malaria:** Diagnosis is primarily via peripheral blood smears (thick/thin) or Rapid Diagnostic Tests (RDTs) for plasmodium antigens. * **Whooping Cough (Bordetella pertussis):** Diagnosed via culture on specialized media (Bordet-Gengou or Regan-Lowe) or PCR. * **Anthrax (Bacillus anthracis):** Diagnosed via Gram stain (Medusa head colonies), McFadyean’s reaction (capsule staining), or the Ascoli precipitin test. **3. NEET-PG High-Yield Pearls:** * **PCH Etiology:** Classically associated with **Late Syphilis**, but currently more common in children following **viral infections** (e.g., Measles, Mumps, CMV). * **Antibody Type:** Remember it is an **IgG** antibody, which is unusual as most "cold" antibodies (like in Cold Agglutinin Disease) are IgM. * **Specificity:** It is almost always directed against the **P-antigen**.

Q: The "Owl's eye" nucleus is a characteristic finding in which type of lymphoma?

Hodgkin's lymphoma. **Explanation:** The "Owl’s eye" appearance is the hallmark morphological feature of the **classic Reed-Sternberg (RS) cell**, which is diagnostic for **Hodgkin’s Lymphoma** [1]. These are large, multinucleated or bilobed cells where each lobe contains a prominent, eosinophilic, inclusion-like nucleolus surrounded by a clear halo, mimicking the eyes of an owl [1]. **Why the other options are incorrect:** * **Non-Hodgkin’s Lymphoma (NHL):** This is a diverse group of malignancies (e.g., Follicular, DLBCL) that typically lack RS cells [1]. They are characterized by a diffuse or nodular proliferation of lymphoid cells without the specific "Owl's eye" morphology. * **Burkitt’s Lymphoma:** This is characterized by a **"Starry sky" appearance** on low power, created by tingible body macrophages (the "stars") consuming apoptotic debris against a background of dark neoplastic B-cells (the "sky"). * **Cutaneous T-cell Lymphoma (Mycosis Fungoides):** This is characterized by **Pautrier’s microabscesses** in the epidermis and "Cerebriform" nuclei (Sezary cells) in the peripheral blood. **High-Yield Clinical Pearls for NEET-PG:** * **Immunophenotype:** Classic RS cells are typically **CD15+ and CD30+**, but negative for CD45 and CD20 (except in the Nodular Lymphocyte Predominant subtype, which is CD20+ and CD45+). * **Variants:** The "Lacunar variant" is specifically associated with the **Nodular Sclerosis** subtype of Hodgkin's Lymphoma [1]. * **Bimodal Age Distribution:** Hodgkin’s Lymphoma typically shows two peaks of incidence (20s and 50s) [1]. * **EBV Association:** The Mixed Cellularity subtype has the strongest association with the Epstein-Barr Virus [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. 614-618.

Q: Reticulocytosis is NOT a feature of which of the following conditions?

Anemia in chronic renal failure. ### Explanation The **Reticulocyte Count** is a direct indicator of the bone marrow's erythropoietic activity. To have reticulocytosis (an increase in young RBCs), two conditions must be met: a functional bone marrow and adequate levels of **Erythropoietin (EPO)**. [1] **Why Option D is Correct:** In **Chronic Renal Failure (CRF)**, the primary cause of anemia is the **deficiency of Erythropoietin**, which is produced by the peritubular interstitial cells of the kidney. [1] Without EPO, the bone marrow is not stimulated to produce RBCs despite the anemia. Therefore, CRF is characterized by a **low reticulocyte count** (hypoproliferative anemia). **Why Other Options are Incorrect:** * **Paroxysmal Nocturnal Hemoglobinuria (PNH) & Hereditary Spherocytosis:** Both are hemolytic anemias. In hemolysis, the bone marrow is healthy and responds to the low hemoglobin by increasing RBC production, leading to significant **reticulocytosis**. * **Following Acute Bleeding:** After a sudden loss of blood, the body compensates by releasing EPO to stimulate the marrow. [1] Within 3–5 days, the reticulocyte count rises as the marrow attempts to replace the lost volume. ### High-Yield Clinical Pearls for NEET-PG * **Corrected Reticulocyte Count (CRC):** In anemia, always use CRC to assess marrow response. $CRC = \text{Observed Retic \%} \times (\text{Patient's Hct} / \text{Normal Hct})$. * **Reticulocyte Production Index (RPI):** An **RPI > 2%** indicates an adequate marrow response (hemolysis/hemorrhage), while **RPI < 2%** indicates an inadequate response (nutritional deficiencies or marrow failure). * **Anemia in CRF:** Usually Normocytic Normochromic. Treatment involves recombinant human erythropoietin (target Hb: 10–12 g/dL). * **Other causes of low reticulocyte count:** Aplastic anemia, Iron/B12/Folate deficiency, and Bone marrow suppression (chemotherapy). [1]

Question 1

Cryoprecipitate contains which of the following components?

Accepted Answer

Factor IX

Answer

Factor VIII

Answer

Fibrinogen

Answer

von Willebrand Factor (vWF)

Question 2

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 anemia

Question 3

JAK-2 mutation is seen in which of the following conditions?

Accepted Answer

Polycythemia Vera

Answer

Idiopathic Thrombocytopenic Purpura (ITP)

Answer

Chronic Myeloid Leukemia (CML)

Answer

Chronic Myelomonocytic Leukemia (CMML)

Question 4

The paraneoplastic hypercalcemia in lymphoma is due to ectopic production of which of the following?

Accepted Answer

1,25 dihydroxyvitamin D

Answer

Parathyroid hormone-related protein

Answer

Parathyroid hormone

Answer

Prostaglandin E2

Question 5

The Donath-Landsteiner reaction is used in the diagnosis of:

Accepted Answer

Paroxysmal cold hemoglobinuria.

Answer

Malaria.

Answer

Whooping cough.

Answer

Anthrax.

Question 6

The "Owl's eye" nucleus is a characteristic finding in which type of lymphoma?

Accepted Answer

Hodgkin's lymphoma

Answer

Non-Hodgkin's lymphoma

Answer

Burkitt's lymphoma

Answer

Cutaneous T-cell lymphoma

Question 7

Reticulocytosis is NOT a feature of which of the following conditions?

Accepted Answer

Anemia in chronic renal failure

Answer

Paroxysmal nocturnal hemoglobinuria

Answer

Following acute bleeding

Answer

Hereditary spherocytosis

Question 8

Flame cells are characteristic of which of the following conditions?

Accepted Answer

Multiple myeloma

Answer

Ewing's sarcoma

Answer

Leukemia

Answer

Osteosarcoma

Question 9

A 63-year-old man has noticed a lump in his neck for 2 months. Examination reveals a group of three discrete nontender right posterior cervical lymph nodes, and a mass of enlarged right axillary lymph nodes. Chest and abdominal CT scans show mediastinal lymphadenopathy and hepatosplenomegaly. Microscopic examination of a cervical lymph node biopsy reveals abundant large CD15+ and CD30+ binucleate cells with prominent acidophilic nucleoli, scattered within a sparse lymphocytic infiltrate. What is molecular analysis of this lesion most likely to reveal?

Accepted Answer

Clonal Epstein-Barr virus (EBV) integration in the large cells

Answer

BCL6 gene rearrangements in the large cells

Answer

Deletions of 5q in all the cells

Answer

Helicobacter pylori infection in all the cells

Question 10

Hemolytic anemia is a feature of deficiency of all RBC enzymes EXCEPT?

Accepted Answer

Lactate dehydrogenase

Answer

Glucose 6 phosphate dehydrogenase

Answer

Pyruvate kinase

Answer

Aldolase A

Hematopathology — MCQs

Hematopathology — MCQs

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