Hematopathology — MCQs

A 16-year-old girl presents with bowel obstruction. Laparotomy reveals markedly enlarged para-aortic lymph nodes. Biopsy of the lymph nodes exhibits a diffuse neoplastic infiltrate of small, round lymphocytes with a 'starry sky' appearance on low power. The cytoplasm of some lymphocytes is vacuolated and fat stains are positive. What would you expect the neoplastic cells to demonstrate?

Q815Medium

Which of the following protein defects does NOT cause hereditary spherocytosis?

Q816Easy

Stored plasma is deficient in which coagulation factors?

Q817Easy

Sickle cell anemia is inherited as which pattern?

Q818Easy

In the Philadelphia chromosome, what genetic defect is present?

Q819Medium

Heavy chain disease with kappa light chains in the urine is known as which of the following?

Q820Medium

Autosplenectomy is seen in which of the following conditions?

Hematopathology Indian Medical PG Practice Questions and MCQs

Question 811: Bence Jones proteins are:

A. Heavy chains of IgG
B. Present in bone marrow
C. Seen in lymphoma
D. Light chains of IgG (Correct Answer)

Explanation: ### Explanation **Correct Option: D (Light chains of IgG)** Bence Jones proteins (BJP) are monoclonal globulins consisting of **free immunoglobulin light chains** (either kappa or lambda) [1]. In plasma cell dyscrasias, particularly **Multiple Myeloma**, there is a disproportionate production of these light chains relative to heavy chains [1]. Due to their low molecular weight (approx. 22-44 kDa), they are easily filtered by the renal glomerulus and appear in the urine [1]. **Analysis of Incorrect Options:** * **A. Heavy chains of IgG:** Heavy chains are much larger and are not typically excreted in urine in this manner [1]. Disorders involving heavy chains are classified separately as "Heavy Chain Diseases." * **B. Present in bone marrow:** While the plasma cells producing these proteins are located in the bone marrow, the term "Bence Jones proteins" specifically refers to the light chains detected in the **urine** [2]. * **C. Seen in lymphoma:** While some B-cell lymphomas (like Waldenström Macroglobulinemia) can produce light chains, BJP is the classic diagnostic hallmark of **Multiple Myeloma** [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Thermal Property:** BJP has a unique characteristic—it precipitates when heated to **40–60°C** and re-dissolves upon boiling (**100–C**). * **Detection:** They are **not** detected by routine urine dipsticks (which react primarily to albumin). Detection requires **Sulphosalicylic Acid (SSA) test** or **Urine Protein Electrophoresis (UPEP)**. * **Renal Impact:** BJP are nephrotoxic [2]. They precipitate with Tamm-Horsfall protein in the distal tubules, forming "hard" waxy casts, leading to **Myeloma Kidney** (Cast Nephropathy) [3]. * **M-Spike:** On serum electrophoresis, the monoclonal proliferation of these proteins appears as a sharp "M-spike" in the gamma-globulin region [4]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 616-617. [2] 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. 607-608. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 618-619. [4] 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.

Question 812: A 33-year-old alcoholic patient on anti-tuberculosis treatment (ATT) presents with increased serum iron and increased transferrin saturation. What is the most likely diagnosis?

A. Iron deficiency anemia
B. Sideroblastic anemia (Correct Answer)
C. Megaloblastic anemia
D. Anemia of chronic disease

Explanation: ### Explanation **Correct Option: B. Sideroblastic Anemia** The clinical presentation of an alcoholic patient on anti-tuberculosis treatment (ATT) with elevated serum iron and transferrin saturation is classic for **Sideroblastic Anemia**. The underlying mechanism is a defect in **heme synthesis**. In this case, two triggers are present: 1. **Isoniazid (INH):** A key component of ATT, INH is a Vitamin B6 (Pyridoxine) antagonist. B6 is a mandatory cofactor for the enzyme **ALAS (delta-aminolevulinic acid synthase)**, the rate-limiting step in heme synthesis. 2. **Alcohol:** It acts as a mitochondrial toxin that further inhibits heme enzymes. When heme synthesis is impaired, iron enters the mitochondria of erythroid precursors but cannot be incorporated into protoporphyrin. This results in iron overload within the mitochondria, forming **ringed sideroblasts** (visible on Prussian blue stain) and elevated systemic iron markers. **Why Other Options are Incorrect:** * **A. Iron Deficiency Anemia:** Characterized by *decreased* serum iron and *decreased* transferrin saturation (opposite of this case) [1]. * **C. Megaloblastic Anemia:** While common in alcoholics (folate deficiency), it presents with macrocytosis and hypersegmented neutrophils, not iron overload. * **D. Anemia of Chronic Disease:** Typically shows *decreased* serum iron and *decreased* TIBC due to iron sequestration by hepcidin [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Bone marrow examination showing **Ringed Sideroblasts** (>15%). * **Morphology:** Dimorphic blood picture (mix of normocytic and microcytic cells) and **Pappenheimer bodies** on peripheral smear [1]. * **Management:** Discontinue the offending agent and supplement with **Pyridoxine (Vitamin B6)**. * **Lead Poisoning:** Another common cause of acquired sideroblastic anemia; look for "basophilic stippling" and "Burtonian lines" on gums. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 590-591. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 658-662.

Question 813: In Disseminated Intravascular Coagulation (DIC), which of the following is true?

A. Increased clotting time
B. Increase in the level of fibrin degradation products
C. Bleeding from all mucous membranes
D. All of the above (Correct Answer)

Explanation: **Explanation:** Disseminated Intravascular Coagulation (DIC) is a complex thrombo-hemorrhagic disorder characterized by the systemic activation of the coagulation cascade, leading to widespread microvascular thrombosis and subsequent consumption of clotting factors and platelets [1]. **Why Option D is correct:** DIC is often referred to as a **"consumptive coagulopathy"** [1]. * **Increased Clotting Time (Option A):** As the body attempts to clot systemically, it exhausts its supply of fibrinogen, prothrombin, and Factors V and VIII [2]. This depletion leads to a prolongation of Prothrombin Time (PT), Activated Partial Thromboplastin Time (aPTT), and Thrombin Time (TT) [2]. * **Increase in FDPs (Option B):** The formation of widespread microthrombi triggers secondary fibrinolysis. Plasmin cleaves fibrin and fibrinogen, resulting in elevated levels of **Fibrin Degradation Products (FDPs)** and **D-dimers** [1][2]. D-dimer is a more specific marker for DIC than FDPs. * **Bleeding from Mucous Membranes (Option C):** Due to the "consumption" of platelets (thrombocytopenia) and clotting factors, the patient enters a hypocoagulable state [1]. This manifests clinically as oozing from venipuncture sites, petechiae, and bleeding from mucous membranes (epistaxis, GI bleed) [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Peripheral Smear:** Characterized by **Schistocytes** (fragmented RBCs) due to microangiopathic hemolytic anemia (MAHA) as RBCs shear against fibrin strands [2]. * **Most Common Cause:** Sepsis (Gram-negative organisms/Endotoxins). * **Specific Association:** Acute Promyelocytic Leukemia (AML M3) is a classic trigger due to the release of procoagulants from granules. * **Best Screening Test:** Platelet count (usually decreased) [2]. * **Most Specific Test:** D-dimer levels. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 151-152. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 625-626.

Question 814: A 16-year-old girl presents with bowel obstruction. Laparotomy reveals markedly enlarged para-aortic lymph nodes. Biopsy of the lymph nodes exhibits a diffuse neoplastic infiltrate of small, round lymphocytes with a 'starry sky' appearance on low power. The cytoplasm of some lymphocytes is vacuolated and fat stains are positive. What would you expect the neoplastic cells to demonstrate?

A. Positive non-specific esterase stain of the cells
B. Positive specific esterase stain of the cells
C. Low leukocyte alkaline phosphatase score
D. t(8;14) translocation (Correct Answer)

Explanation: **Explanation:** The clinical presentation and histopathology are classic for **Burkitt Lymphoma (BL)**. In children and young adults, BL often presents at extranodal sites (like the ileocecal region causing bowel obstruction). The "starry sky" appearance is the hallmark of BL, created by pale-staining tingible body macrophages (the "stars") phagocytosing apoptotic debris amidst a "sea" of dark, rapidly dividing neoplastic B-cells [1]. The cytoplasmic vacuoles represent lipid droplets, which are characteristic of the FAB L3 morphology. **Why the correct answer is right:** * **t(8;14) translocation:** This is the cytogenetic hallmark of Burkitt Lymphoma (found in ~80% of cases). It involves the translocation of the **c-MYC proto-oncogene** from chromosome 8 to the **Ig heavy chain (IgH)** locus on chromosome 14. This leads to constitutive overexpression of c-MYC, a potent transcription factor that drives rapid cell proliferation. **Why the other options are wrong:** * **Options A & B:** Non-specific and specific esterase stains are used to differentiate lineages in **Acute Myeloid Leukemia (AML)**. Non-specific esterase (NSE) is positive in monocytic lineages (M4, M5), while specific esterase (Chloroacetate esterase) is positive in granulocytic lineages. * **Option C:** A low **Leukocyte Alkaline Phosphatase (LAP) score** is characteristic of **Chronic Myeloid Leukemia (CML)**, not lymphomas. **High-Yield Pearls for NEET-PG:** * **Variants:** Endemic (African/EBV-associated, jaw involvement), Sporadic (Abdominal involvement), and Immunodeficiency-associated. * **Immunophenotype:** CD19+, CD20+, CD10+, BCL-6+, and **BCL-2 negative**. * **Proliferation Index:** Ki-67 index is typically **>99%** ("starry sky" reflects high cell turnover) [1]. * **Other Translocations:** t(2;8) [kappa light chain] and t(8;22) [lambda light chain]. **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. 606.

Question 815: Which of the following protein defects does NOT cause hereditary spherocytosis?

A. Ankyrin
B. Palladin
C. Glycophorin C (Correct Answer)
D. Anion transport protein

Explanation: **Explanation:** Hereditary Spherocytosis (HS) is a clinical syndrome caused by inherited defects in the **red cell membrane cytoskeleton**, specifically the proteins that provide vertical stability between the lipid bilayer and the underlying protein scaffold [1]. **1. Why Glycophorin C is the Correct Answer:** Glycophorin C is a transmembrane protein that interacts with Protein 4.1. Deficiencies in Glycophorin C or Protein 4.1 are classically associated with **Hereditary Elliptocytosis (HE)**, not spherocytosis. In HE, the defect affects the horizontal stability of the membrane, leading to the elongation of cells into an elliptical shape. **2. Why the other options are incorrect:** * **Ankyrin (Option A):** This is the **most common** protein defect in Hereditary Spherocytosis (approx. 50-60% of cases). It anchors the spectrin cytoskeleton to the lipid bilayer [1]. * **Palladin (Protein 4.2) (Option B):** Protein 4.2 (Palladin) stabilizes the link between ankyrin and the anion exchanger [1]. Its deficiency is a well-documented cause of HS, particularly in Japanese populations. * **Anion Transport Protein (Band 3) (Option D):** This is the second most common defect in HS [1]. It is a major transmembrane protein; its deficiency leads to a loss of membrane surface area, resulting in the characteristic spherical shape [1]. **Clinical Pearls for NEET-PG:** * **Pathophysiology:** Loss of vertical membrane stability → membrane blebbing (microvesiculation) → reduced surface-area-to-volume ratio → Spherocyte formation [1]. * **Key Lab Finding:** Increased **MCHC** (>36 g/dL) is a highly specific marker for HS. * **Diagnostic Test:** The **Osmotic Fragility Test** (increased fragility) and the more specific **EMA Binding Test** (Flow Cytometry) are high-yield [2]. * **Treatment:** Splenectomy is the definitive treatment for symptomatic cases, as the spleen is the primary site of extravascular hemolysis [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 640-641. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 597-598.

Question 816: Stored plasma is deficient in which coagulation factors?

A. Factors 7 and 8
B. Factors 2 and 5
C. Factors 5 and 8 (Correct Answer)
D. Factors 7 and 9

Explanation: ### Explanation The correct answer is **Factors 5 and 8**. **1. Why Factors 5 and 8 are correct:** Coagulation factors are categorized based on their stability during storage. **Factor V (Proaccelerin)** and **Factor VIII (Anti-hemophilic factor)** are known as **labile factors**. They are highly sensitive to temperature and rapidly lose their procoagulant activity when blood or plasma is stored at 4°C. In stored bank blood, Factor VIII activity drops by about 50% within 24 hours. Therefore, to provide these factors, **Fresh Frozen Plasma (FFP)** or **Cryoprecipitate** (specifically for Factor VIII) must be used instead of stored whole blood or stored plasma. **2. Why the other options are incorrect:** * **Factors 2, 7, 9, and 10:** These are the Vitamin K-dependent factors. They are considered **stable factors** and maintain their activity levels for several weeks in stored plasma. * **Factor 1 (Fibrinogen):** This is also a stable factor and remains functional in stored blood. **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Labile Factors:** V and VIII (Think: "5 and 8 keep the blood great, but they don't like to wait"). * **Fresh Frozen Plasma (FFP):** Contains all coagulation factors. It is the treatment of choice for multiple factor deficiencies (e.g., Liver disease, DIC, Warfarin overdose). * **Cryoprecipitate:** Contains Factor VIII, Fibrinogen, von Willebrand Factor (vWF), and Factor XIII. It does *not* contain Factor V. * **Storage Lesion:** This refers to the biochemical and morphological changes in stored blood, which include a decrease in 2,3-DPG (shifting the oxygen dissociation curve to the left), a decrease in pH, and an increase in plasma potassium.

Question 817: Sickle cell anemia is inherited as which pattern?

A. Autosomal recessive (Correct Answer)
B. Autosomal dominant
C. X-linked recessive
D. X-linked dominant

Explanation: **Explanation:** Sickle Cell Anemia (SCA) is a classic example of an **autosomal recessive** disorder [2]. It is caused by a point mutation (missense mutation) in the $\beta$-globin gene located on **chromosome 11**, where glutamic acid is replaced by valine at the 6th position [1]. 1. **Why Autosomal Recessive is Correct:** For the clinical disease (HbSS) to manifest, an individual must inherit two copies of the mutated gene (homozygous) [2]. If an individual inherits only one mutated gene (HbAS), they are considered a "carrier" (Sickle Cell Trait) and are generally asymptomatic, which is the hallmark of a recessive inheritance pattern [1], [2]. 2. **Why Other Options are Incorrect:** * **Autosomal Dominant:** These disorders (e.g., Hereditary Spherocytosis) manifest even with a single copy of the mutated gene [2]. In SCA, a single gene does not cause the full-blown disease. * **X-linked Recessive/Dominant:** These involve mutations on the X chromosome (e.g., Hemophilia, G6PD deficiency) [3]. Since the $\beta$-globin gene is on chromosome 11 (an autosome), it affects males and females equally and is not linked to sex chromosomes [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Molecular Basis:** Point mutation ($GAG \rightarrow GTG$) involving valine substitution at position 6 [1]. * **Protective Effect:** Sickle cell trait (HbAS) provides a selective survival advantage against *Plasmodium falciparum* malaria. * **Diagnosis:** **Hb Electrophoresis** is the gold standard (HbS moves slowest toward the anode due to loss of negative charge). * **Screening:** Solubility test (using sodium dithionite) or Sickling test (using sodium metabisulfite). * **Complications:** Vaso-occlusive crises, Autosplenectomy (Howell-Jolly bodies), and Acute Chest Syndrome [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 598-599. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 53-54. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, p. 151.

Question 818: In the Philadelphia chromosome, what genetic defect is present?

A. Short arm of chromosome 22
B. Long arm of chromosome 22 (Correct Answer)
C. Short arm of chromosome 9
D. Chromosome 21

Explanation: ### Explanation The **Philadelphia chromosome (Ph)** is the hallmark cytogenetic abnormality of **Chronic Myeloid Leukemia (CML)**, found in over 95% of cases [1], [3]. It results from a **reciprocal translocation between chromosomes 9 and 22**, specifically denoted as **t(9;22)(q34;q11)** [1], [3]. 1. **Why Option B is correct:** In this translocation, the *ABL1* proto-oncogene from the **long arm (q)** of chromosome 9 moves to the **long arm (q)** of chromosome 22 [3]. It fuses with the *BCR* (Breakpoint Cluster Region) gene. The resulting shortened chromosome 22, containing the **BCR-ABL1 fusion gene**, is known as the Philadelphia chromosome [1]. This fusion gene encodes a chimeric protein with constitutive **tyrosine kinase activity**, driving uncontrolled myeloproliferation [2]. 2. **Why other options are incorrect:** * **Option A & C:** The translocation involves the **long arms (q)** of both chromosomes, not the short arms (p). * **Option D:** Chromosome 21 is not involved in the Philadelphia translocation [4]. It is, however, associated with Down Syndrome (Trisomy 21), which carries an increased risk of Acute Megakaryoblastic Leukemia (AML M7) [4]. ### High-Yield Clinical Pearls for NEET-PG: * **Molecular Signature:** The BCR-ABL1 fusion protein is typically **p210** in CML and **p190** in Ph+ Acute Lymphoblastic Leukemia (ALL). * **Diagnosis:** Gold standard is **FISH** (Fluorescence In Situ Hybridization) or **RT-PCR** to detect the fusion gene [1]. * **Treatment:** The first-line therapy is **Imatinib** (a Tyrosine Kinase Inhibitor), which competitively binds to the ATP-binding site of the BCR-ABL protein [1]. * **Prognosis:** Presence of Ph chromosome in ALL signifies a **poor prognosis**, whereas in CML, it is essential for the diagnosis and targeted therapy. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 225-226. [2] 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. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 605-607. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 170-171.

Question 819: Heavy chain disease with kappa light chains in the urine is known as which of the following?

A. Mu chain disease (Correct Answer)
B. Seligman disease
C. Franklin disease
D. Waldenstrom macroglobulinemia

Explanation: **Explanation:** **Heavy Chain Diseases (HCDs)** are rare B-cell neoplasms characterized by the production of truncated monoclonal heavy chains without associated light chains. However, **Mu chain disease** is the unique exception to this rule. 1. **Why Mu chain disease is correct:** In Mu chain disease (associated with Chronic Lymphocytic Leukemia/CLL), the malignant cells produce incomplete IgM heavy chains. Unlike other HCDs, approximately **50-60% of patients with Mu chain disease also secrete monoclonal kappa light chains**, which appear in the urine as Bence-Jones proteins. This co-secretion is a diagnostic hallmark that distinguishes it from Alpha and Gamma chain diseases. 2. **Analysis of Incorrect Options:** * **Seligman disease (Alpha chain disease):** The most common HCD, typically involving the gastrointestinal tract (IPSID). It produces alpha heavy chains but **never** secretes light chains. * **Franklin disease (Gamma chain disease):** Presents like a systemic lymphoma with lymphadenopathy and palatal edema. It involves gamma heavy chains and **does not** involve light chain secretion. * **Waldenstrom macroglobulinemia:** This is a lymphoplasmacytic lymphoma that produces **complete** IgM antibodies (both heavy and light chains), not just isolated heavy chains. [1] **Clinical Pearls for NEET-PG:** * **Alpha chain disease:** Most common HCD; associated with *Campylobacter jejuni*; presents as malabsorption. * **Gamma chain disease:** Characterized by "uvular edema" due to Waldeyer’s ring involvement. * **Mu chain disease:** Least common HCD; almost always associated with underlying CLL and hepatosplenomegaly; look for **vacuolated plasma cells** in the bone marrow. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 616-617.

Question 820: Autosplenectomy is seen in which of the following conditions?

A. Hereditary spherocytosis
B. Sickle cell disease (Correct Answer)
C. Thalassaemia
D. Autoimmune anemia

Explanation: **Explanation:** **1. Why Sickle Cell Disease (SCD) is correct:** Autosplenectomy is a hallmark of **Sickle Cell Anemia (HbSS)** [2]. The underlying mechanism is chronic **vaso-occlusion** [4]. In the hypoxic and acidic environment of the splenic sinusoids, HbS polymerizes, causing red blood cells to "sickle." These rigid cells get trapped, leading to repeated micro-infarctions [3]. Over time, the splenic tissue is replaced by fibrous scar tissue and calcium deposits (siderofibrotic nodules or **Gamna-Gandy bodies**). By adulthood, the spleen becomes a small, shrunken, non-functional fibrous remnant [1]. **2. Why other options are incorrect:** * **Hereditary Spherocytosis:** Characterized by **Splenomegaly** (enlargement). The spleen actively traps and destroys spherical RBCs, leading to congestive enlargement rather than atrophy. * **Thalassemia:** Results in massive **Splenomegaly**. This occurs due to extramedullary hematopoiesis and the constant removal of damaged RBCs (containing Heinz bodies/alpha-globin chains). * **Autoimmune Hemolytic Anemia (AIHA):** Typically presents with mild to moderate **Splenomegaly** as the spleen is the primary site for the destruction of IgG-coated RBCs (extravascular hemolysis). **3. High-Yield Clinical Pearls for NEET-PG:** * **Howell-Jolly Bodies:** Their presence on a peripheral smear is a classic sign of functional asplenia/autosplenectomy [3]. * **Infection Risk:** Patients are highly susceptible to **encapsulated organisms** (*S. pneumoniae, H. influenzae, N. meningitidis*) [1]. * **Splenic Sequestration Crisis:** A life-threatening complication in children before autosplenectomy occurs, where the spleen rapidly traps a large volume of blood. * **Gamna-Gandy Bodies:** Small, brown-yellow foci of hemosiderin and calcium found in the shrunken spleen of SCD. **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. 631-632. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 645-646. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 644-645. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 598-599.

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Hemolytic Anemias

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