Hematology Practice Questions

Q: A child presents with bleeding from the gums and a swollen knee. What is the most likely diagnosis?

Hemophilia. **Explanation:** The clinical presentation of a **swollen knee** (suggestive of hemarthrosis) combined with mucosal bleeding (gum bleeding) in a child is a classic indicator of a coagulation factor deficiency, most commonly **Hemophilia A (Factor VIII)** or **B (Factor IX)**. 1. **Why Hemophilia is correct:** Hemophilia is characterized by deep tissue bleeding, such as **hemarthrosis** (bleeding into joints) and muscle hematomas. While gum bleeding is often associated with platelet disorders, it can also occur in severe hemophilia following minor trauma or poor dental hygiene. The presence of a swollen joint (hemarthrosis) is the "hallmark" sign that points specifically to a clotting factor deficiency rather than a primary hemostatic defect. 2. **Why other options are incorrect:** * **ITP:** Typically presents with superficial "platelet-type" bleeding, such as petechiae, purpura, and ecchymosis. Hemarthrosis is extremely rare in ITP. * **Scurvy:** Vitamin C deficiency causes gum bleeding (swollen, spongy gums) and subperiosteal hemorrhages, which can cause limb pain (pseudoparalysis), but it does not typically cause true intra-articular joint swelling (hemarthrosis). * **Trauma:** While trauma can cause a swollen knee, it would not explain spontaneous or recurrent gum bleeding unless there was a systemic underlying pathology. **High-Yield Clinical Pearls for NEET-PG:** * **Inheritance:** Hemophilia A and B are **X-linked recessive** (mostly affects males). * **Lab Findings:** Isolated **prolonged aPTT** with a normal PT and normal bleeding time. * **Most common joint involved:** The **knee** is the most common site of hemarthrosis in children. * **Treatment:** Replacement of the specific deficient factor. For Hemophilia A, Emicizumab (a bispecific antibody) is a newer non-factor therapy.

Q: The mother of a child with idiopathic thrombocytopenic purpura is worried about serious bleeding. When reassuring this mother, what is the approximate platelet count threshold for generalized bleeding?

20,000/mm 3. **Explanation:** In pediatric Idiopathic Thrombocytopenic Purpura (ITP), the risk of spontaneous, generalized bleeding (such as epistaxis, hematuria, or gastrointestinal hemorrhage) is closely correlated with the absolute platelet count. 1. **Why 20,000/mm³ is correct:** While the normal platelet range is 1.5–4.5 lakh/mm³, the body maintains primary hemostasis effectively even with reduced numbers. The threshold of **20,000/mm³** is clinically significant because spontaneous, life-threatening bleeding is rare above this level. Most children with counts >20,000/mm³ only exhibit cutaneous symptoms (petechiae/bruising) and can often be managed with observation ("watch and wait") rather than aggressive medical intervention. 2. **Analysis of Incorrect Options:** * **5,000/mm³:** This is the critical threshold for **Intracranial Hemorrhage (ICH)**. While generalized bleeding occurs here, it is an extreme danger zone rather than the standard threshold for general systemic bleeding. * **50,000/mm³:** At this level, patients are generally asymptomatic. Bleeding usually only occurs following significant trauma or major surgery. * **100,000/mm³:** This is considered mild thrombocytopenia. Hemostasis is clinically normal, and no spontaneous bleeding occurs. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause** of isolated thrombocytopenia in an otherwise healthy child is ITP. * **Management:** If platelets are >20,000/mm³ and the child is asymptomatic, observation is preferred. If <20,000/mm³ with mucosal bleeding, first-line treatments include **IVIG** or **Corticosteroids**. * **Bone Marrow Aspiration:** Not mandatory unless atypical features (fever, bone pain, lymphadenopathy) are present to rule out Leukemia. If done, it shows **increased megakaryocytes**.

Q: A child presents with seborrheic dermatitis, sinusitis, and chronically draining ears. On examination, the child has failure to thrive with hepatosplenomegaly and exophthalmos. What is the probable diagnosis?

Histiocytosis-X. **Explanation:** The clinical presentation described is a classic triad of **Langerhans Cell Histiocytosis (LCH)**, formerly known as **Histiocytosis-X**. **Why Histiocytosis-X is correct:** LCH is characterized by the abnormal proliferation of Langerhans cells. The case describes the **Hand-Schüller-Christian disease** variant, which typically presents with a triad of **exophthalmos, diabetes insipidus (due to pituitary involvement), and lytic bone lesions**. * **Skin:** Seborrheic dermatitis-like rash (often involving the scalp and diaper area) is a hallmark. * **Ears:** Chronic ear discharge (otitis media/externa) unresponsive to antibiotics is a high-yield sign. * **Systemic:** Hepatomegaly and failure to thrive indicate multisystem involvement (Letterer-Siwe disease spectrum). **Why other options are incorrect:** * **Wegener’s Granulomatosis:** While it causes sinusitis and ear issues, it typically presents with pulmonary nodules and glomerulonephritis (hematuria) in older patients, not seborrheic dermatitis or exophthalmos in children. * **Chronic Granulomatous Disease (CGD):** A defect in phagocytic NADPH oxidase leading to recurrent catalase-positive infections (abscesses, osteomyelitis). It does not cause exophthalmos or lytic bone lesions. * **Chediak-Higashi Syndrome:** Characterized by partial oculocutaneous albinism, giant granules in neutrophils, and recurrent pyogenic infections, not the specific triad seen here. **NEET-PG High-Yield Pearls:** 1. **Pathognomonic finding:** **Birbeck granules** (tennis-racket shaped) on electron microscopy. 2. **Immunohistochemistry:** Positive for **CD1a, S-100, and CD207 (Langerin)**. 3. **Bone Lesions:** "Punched-out" lytic lesions, especially in the skull. 4. **Ear Involvement:** Chronic draining ears in a child with a scalp rash should always trigger suspicion of LCH.

Q: A serious coagulopathy characterized by severe thrombocytopenia and hemorrhage due to platelet trapping within the tumor is called?

Kasabach-Merrit Phenomenon. ### Explanation **Kasabach-Merritt Phenomenon (KMP)** is the correct answer. It is a life-threatening hematologic condition characterized by the combination of a rapidly enlarging vascular tumor, **profound thrombocytopenia**, and consumptive coagulopathy. **1. Why it is correct:** The underlying mechanism involves **platelet trapping** and activation within the abnormal architecture of specific vascular tumors. This leads to the consumption of platelets and clotting factors (DIC-like picture), resulting in severe hemorrhage. It is most commonly associated with **Tufted Angioma** or **Kaposiform Hemangioendothelioma**, rather than common infantile hemangiomas. **2. Why other options are incorrect:** * **PHACE(S) Syndrome:** This is a neurocutaneous syndrome involving **P**osterior fossa malformations, **H**emangiomas (large, segmental), **A**rterial anomalies, **C**ardiac defects, and **E**ye anomalies. It does not inherently involve platelet sequestration. * **Kaposi’s Sarcoma:** A spindle-cell tumor caused by HHV-8, typically seen in immunocompromised patients (AIDS). While it is a vascular tumor, it does not cause the systemic consumptive coagulopathy seen in KMP. * **Hemangioma:** While common infantile hemangiomas are benign vascular tumors, they **do not** cause Kasabach-Merritt Phenomenon. KMP is specific to more aggressive vascular neoplasms like Kaposiform Hemangioendothelioma. **3. NEET-PG High-Yield Pearls:** * **Classic Triad:** Large vascular tumor + Thrombocytopenia + Microangiopathic hemolytic anemia. * **First-line Treatment:** Systemic corticosteroids and **Sirolimus** (mTOR inhibitor) are currently preferred. * **Lab Findings:** Low platelets, low fibrinogen, and elevated D-dimer (consumptive coagulopathy). * **Avoid:** Platelet transfusions should be avoided unless there is active bleeding, as they may "fuel the fire" by being trapped in the tumor.

Q: Fanconi's anemia is a type of:

Constitutional anemia. **Explanation:** **Fanconi’s Anemia (FA)** is the most common cause of **inherited (constitutional) aplastic anemia**. It is an autosomal recessive (rarely X-linked) DNA repair disorder characterized by hypersensitivity to DNA cross-linking agents. The term "constitutional" refers to the fact that the condition is congenital and arises from an underlying genetic defect present from birth, leading to progressive bone marrow failure. **Analysis of Options:** * **Option A (Correct):** It is a constitutional anemia because it is a hereditary syndrome involving pancytopenia. It typically presents between 5–10 years of age with macrocytic anemia progressing to aplastic anemia. * **Option B (Incorrect):** Hemolytic anemias involve the premature destruction of RBCs (e.g., Spherocytosis, G6PD deficiency). FA is a failure of production (hypoplasia), not destruction. * **Option C (Incorrect):** Iron deficiency is a nutritional microcytic anemia. FA is a normocytic to macrocytic anemia caused by stem cell depletion. * **Option D (Incorrect):** Autoimmune anemias (like AIHA) involve antibody-mediated destruction. While some aplastic anemias are T-cell mediated (acquired), FA is strictly genetic. **High-Yield Clinical Pearls for NEET-PG:** * **Physical Findings:** Short stature, **absent/hypoplastic thumbs**, radius abnormalities, microcephaly, and **Café-au-lait spots**. * **Gold Standard Diagnosis:** **Chromosomal Breakage Analysis** (using Mitomycin C or Diepoxybutane). * **Malignancy Risk:** High predisposition to **AML** and squamous cell carcinomas (head and neck). * **Treatment:** Hematopoietic stem cell transplant (HSCT) is the definitive cure for hematologic manifestations.

Q: What type of anemia can develop in a baby fed exclusively on goat's milk?

Megaloblastic anemia. **Explanation:** The correct answer is **Megaloblastic anemia**. **Why it is correct:** Goat’s milk is notoriously deficient in **folate (Vitamin B9)** and **Vitamin B12**, and it contains significantly lower amounts of iron compared to breast milk. Folate is essential for DNA synthesis during the maturation of red blood cells. Exclusive goat's milk feeding leads to a deficiency in these hematinic factors, resulting in impaired DNA synthesis while RNA synthesis continues. This "nucleo-cytoplasmic asynchrony" leads to the formation of large, immature red blood cells known as megaloblasts, manifesting clinically as megaloblastic anemia. **Why the other options are incorrect:** * **Microcytic and Hypochromic anemia (Options B & C):** These are characteristic of Iron Deficiency Anemia (IDA). While goat's milk is low in iron, the most classic and rapid hematological complication associated specifically with goat's milk in pediatric literature is folate-deficiency megaloblastic anemia. * **Normochromic anemia (Option D):** This refers to RBCs with normal hemoglobin concentration, typically seen in anemia of chronic disease or acute blood loss, which does not align with the nutritional deficiency caused by goat's milk. **NEET-PG High-Yield Pearls:** * **"Goat Milk Anemia"** is a classic keyword for **Folate deficiency**. * Goat's milk has only about **6 μg/L of folate**, whereas cow's milk has ~50 μg/L and human milk has ~85 μg/L. * Goat's milk is also highly allergenic and has a high renal solute load, making it unsuitable for infants under 1 year of age. * Always look for **hypersegmented neutrophils** on a peripheral smear to confirm megaloblastic changes.

Q: What is the treatment of choice for severe ITP?

Intravenous immunoglobulin (IV gammaglobulins). **Explanation:** Immune Thrombocytopenic Purpura (ITP) in children is typically a self-limiting condition. However, in cases of **severe ITP** (defined by significant mucosal bleeding or a platelet count <10,000/mm³), rapid elevation of the platelet count is necessary to prevent life-threatening complications like intracranial hemorrhage. **Why IVIG is the Treatment of Choice:** Intravenous Immunoglobulin (IVIG) is the preferred treatment for severe ITP because it provides the **fastest rise in platelet count** (usually within 24–48 hours). It works by saturating the Fc receptors on splenic macrophages, thereby preventing the destruction of antibody-coated platelets. **Analysis of Other Options:** * **Steroids (Option D):** While steroids are the first-line treatment for *mild to moderate* symptomatic ITP, they take longer (3–7 days) to increase platelet counts compared to IVIG. * **Plasmapheresis (Option C):** This is used to remove circulating toxins or autoantibodies in conditions like TTP or Goodpasture syndrome, but it has no established role in the routine management of ITP. * **Bone Marrow Transplant (Option A):** BMT is used for bone marrow failure syndromes (e.g., Aplastic Anemia) or malignancies, not for peripheral destructive processes like ITP. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause** of isolated thrombocytopenia in an otherwise healthy child is ITP. * **Indication for treatment:** Treatment is based on **bleeding severity**, not just the absolute platelet count. * **Anti-D therapy:** Can be used as an alternative to IVIG in Rh-positive, non-splenectomized patients. * **Chronic ITP:** Defined as thrombocytopenia persisting for >12 months. Second-line agents include Rituximab or TPO-receptor agonists (Eltrombopag).

Question 1

A child presents with bleeding from the gums and a swollen knee. What is the most likely diagnosis?

Accepted Answer

Hemophilia

Answer

Idiopathic Thrombocytopenic Purpura (ITP)

Answer

Scurvy

Answer

Trauma

Question 2

The mother of a child with idiopathic thrombocytopenic purpura is worried about serious bleeding. When reassuring this mother, what is the approximate platelet count threshold for generalized bleeding?

Accepted Answer

20,000/mm
3

Answer

5,000/mm
3

Answer

50,000/mm
3

Answer

100,000/mm
3

Question 3

A child presents with seborrheic dermatitis, sinusitis, and chronically draining ears. On examination, the child has failure to thrive with hepatosplenomegaly and exophthalmos. What is the probable diagnosis?

Accepted Answer

Histiocytosis-X

Answer

Wegener's granulomatosis

Answer

Chronic granulomatous disease

Answer

Chediak-Higashi syndrome

Question 4

A five-year-old child presents with chronic bed wetting and bilateral loose deciduous first molars. His mother reports that he drinks water several times during each night. Which of the following is the most likely diagnosis?

Accepted Answer

Hand-Schüller-Christian disease

Answer

Marble bone disease

Answer

Niemann-Pick disease

Answer

Polyostotic fibrous dysplasia

Question 5

A serious coagulopathy characterized by severe thrombocytopenia and hemorrhage due to platelet trapping within the tumor is called?

Accepted Answer

Kasabach-Merrit Phenomenon

Answer

Phace (S) Syndrome

Answer

Kaposi's sarcoma

Answer

Hemangioma

Question 6

Fanconi's anemia is a type of:

Accepted Answer

Constitutional anemia

Answer

Hemolytic anemia

Answer

Iron deficiency anemia

Answer

Autoimmune anemia

Question 7

What type of anemia can develop in a baby fed exclusively on goat's milk?

Accepted Answer

Megaloblastic anemia

Answer

Microcytic anemia

Answer

Hypochromic anemia

Answer

Normochromic anemia

Question 8

What is the treatment of choice for severe ITP?

Accepted Answer

Intravenous immunoglobulin (IV gammaglobulins)

Answer

Bone Marrow Transplant (BMT)

Answer

Plasmapheresis

Answer

Steroids

Question 9

Which of the following is true about Chronic Myeloid Leukemia (CML) in children?

Accepted Answer

Protein tyrosine kinase inhibitors are used in the treatment of CML.

Answer

The Philadelphia chromosome results from a translocation between the long arm of chromosome 9 and the short arm of chromosome 22.

Answer

CML commonly presents as blast crisis.

Answer

CML is the second most common leukemia in children.

Question 10

A newborn baby presented with profuse bleeding from the umbilical stump. Rest of the examination and PT, APTT are within normal limits. Most likely diagnosis is which of the following?

Accepted Answer

Glanzmann's thrombasthenia

Answer

Factor X deficiency

Answer

Von Willebrand disease

Answer

Bernard-Soulier disease

Hematology — MCQs

Hematology — MCQs

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