Hematopathology — MCQs

A 50-year-old female patient complains of weakness and pain in her back. She has a history of recurrent infections. Laboratory investigations reveal the presence of Bence Jones proteins in her urine. This condition results from the overproduction of abnormal immunoglobulins, which are mostly of which type?

Q839Easy

In β-thalassemia, what is the characteristic defect regarding the beta-globin chain?

Q840Easy

Which of the following is involved in hereditary spherocytosis?

Hematopathology Indian Medical PG Practice Questions and MCQs

Question 831: Non-specific esterase is present in which of the following?

A. Megakaryocytic leukemia
B. Lymphocytic leukemia
C. Erythroleukemia
D. Acute Myeloid Leukemia (AML) (Correct Answer)

Explanation: ### Explanation In hematopathology, cytochemical stains are essential for differentiating the lineage of blasts in Acute Leukemias. **Non-specific esterase (NSE)**, such as alpha-naphthyl acetate esterase, is a marker used to identify cells of **monocytic lineage**. **1. Why the Correct Answer is Right:** * **Acute Myeloid Leukemia (AML):** Specifically, the monocytic subtypes of AML (**FAB M4 - Myelomonocytic** and **FAB M5 - Monocytic**) show strong positivity for NSE [1]. While Myeloperoxidase (MPO) and Sudan Black B (SBB) identify granulocytic differentiation, NSE is the gold standard for confirming a monocytic component. Since AML encompasses these subtypes, it is the correct choice [2]. **2. Why the Other Options are Wrong:** * **A. Megakaryocytic leukemia (AML-M7):** These blasts are typically negative for NSE (though they may show focal "platelet-type" acid phosphatase positivity). They are best identified by flow cytometry (CD41, CD61). * **B. Lymphocytic leukemia (ALL):** Lymphoblasts are characteristically **NSE negative**. They are typically identified by Periodic Acid-Schiff (PAS) positivity in a "block-like" pattern. * **C. Erythroleukemia (AML-M6):** These cells are usually NSE negative but show strong, globular PAS positivity. **3. High-Yield Clinical Pearls for NEET-PG:** * **MPO/SBB:** Positive in AML M1, M2, M3, M4; Negative in ALL. * **NSE (Non-specific Esterase):** Positive in M4 and M5 [2]. It is **inhibited by Sodium Fluoride (NaF)** in monocytic cells. * **Specific Esterase (Chloroacetate Esterase):** Positive in granulocytic cells (M1, M2, M3). * **PAS (Periodic Acid-Schiff):** Positive in ALL (block-like) and AML-M6 (diffuse/globular). * **Auer Rods:** Pathognomonic for AML (especially M3); they are clumps of azurophilic granules containing MPO. **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. 620. [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. 621-622.

Question 832: A 68-year-old man with prostate cancer and bone metastases presents with shaking chills and fever. The peripheral WBC count is 1,000/mL (normal = 4,000 to 11,000/mL). Which of the following terms best describes this hematologic finding?

A. Leukocytosis
B. Leukopenia (Correct Answer)
C. Neutrophilia
D. Leukemoid reaction

Explanation: **Explanation:** **1. Why Leukopenia is Correct:** The patient’s peripheral White Blood Cell (WBC) count is **1,000/mL**, which is significantly below the normal reference range of **4,000 to 11,000/mL**. The medical term for a reduction in the total number of circulating leukocytes is **Leukopenia** [1]. In this clinical scenario, the leukopenia is likely secondary to **myelophthisis** (replacement of bone marrow by metastatic prostate cancer) or sepsis-induced consumption [1]. **2. Why the Other Options are Incorrect:** * **A. Leukocytosis:** This refers to an *increase* in the total WBC count (>11,000/mL), typically seen in infections, inflammation, or malignancy. * **C. Neutrophilia:** This is a specific increase in the absolute *neutrophil* count (>7,000/mL). While neutrophils are a subset of WBCs, the question provides the total WBC count, and the value is decreased, not increased. * **D. Leukemoid Reaction:** This is an extreme leukocytosis (usually >50,000/mL) characterized by a significant left shift (immature precursors), often mimicking leukemia but occurring in response to severe infection or inflammation. **3. Clinical Pearls for NEET-PG:** * **Myelophthisic Anemia:** When bone marrow is infiltrated by tumors (like prostate or breast cancer), fibrosis, or granulomas, it leads to a "space-occupying" effect. This often results in **pancytopenia** and the presence of **teardrop RBCs (dacrocytes)** and immature cells on a peripheral smear (leukoerythroblastic picture). * **Agranulocytosis:** A severe form of leukopenia where the neutrophil count drops below 500/mL, making the patient highly susceptible to life-threatening infections. * **Prostate Cancer Metastasis:** Classically presents as **osteoblastic** (bone-forming) lesions on imaging, which can displace normal hematopoietic tissue. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 110-111.

Question 833: Which subtype of Hodgkin's disease is histogenetically distinct from all other subtypes?

A. Lymphocyte predominant (Correct Answer)
B. Nodular sclerosis
C. Mixed cellularity
D. Lymphocyte depleted

Explanation: **Explanation:** The correct answer is **Lymphocyte Predominant** (specifically, Nodular Lymphocyte Predominant Hodgkin Lymphoma - NLPHL). **Why it is histogenetically distinct:** Hodgkin Lymphoma (HL) is divided into two major categories: **Classical HL (CHL)** and **NLPHL**. 1. **Cell Origin:** In NLPHL, the neoplastic cells are **"Popcorn cells"** (L&H cells), which are germinal center B-cells that retain their B-cell phenotype [1]. In contrast, all other subtypes (Options B, C, and D) belong to Classical HL, where the Reed-Sternberg (RS) cells lose most characteristic B-cell markers [3]. 2. **Immunophenotype:** NLPHL is **CD20+ and CD45+**, but **CD15- and CD30-** [1]. Classical HL subtypes are the exact opposite: **CD15+ and CD30+**, but usually **CD20- and CD45-** [4]. **Analysis of Incorrect Options:** * **B, C, and D (Nodular Sclerosis, Mixed Cellularity, Lymphocyte Depleted):** These are all subtypes of **Classical Hodgkin Lymphoma**. They share a common histogenesis, clinical progression, and immunophenotype (CD15+, CD30+) [4]. They differ only in their background inflammatory milieu and morphology, not their fundamental cell of origin. **High-Yield Clinical Pearls for NEET-PG:** * **NLPHL:** Most common in young males; presents with localized peripheral lymphadenopathy (cervical/axillary); has an excellent prognosis but carries a risk of transformation to Diffuse Large B-cell Lymphoma (DLBCL) [1]. * **Nodular Sclerosis:** Most common subtype overall; characterized by **Lacunar cells** and collagen bands; common in young females (mediastinal mass) [4]. * **Mixed Cellularity:** Strongly associated with **EBV infection**; rich in eosinophils and plasma cells [4]. * **Lymphocyte Depleted:** Worst prognosis; associated with HIV/immunodeficiency [2]. **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. 618. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 559-560. [3] 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. 614-616. [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. 616-618.

Question 834: All of the following syndromes are associated with Acute Myeloid Leukemia except?

A. Down's syndrome
B. Klinefelter's syndrome
C. Patau syndrome
D. Turner's syndrome (Correct Answer)

Explanation: **Explanation:** The association between chromosomal aneuploidies and hematological malignancies is a high-yield topic in NEET-PG. The correct answer is **Turner’s syndrome (45, XO)**, as it is notably **not** associated with an increased risk of Acute Myeloid Leukemia (AML). While Turner’s syndrome is linked to certain solid tumors (like gonadoblastoma in those with Y-chromosome mosaicism), it does not predispose patients to leukemogenesis. **Analysis of Options:** * **Down’s Syndrome (Trisomy 21):** This has the strongest association with AML [1]. Children with Down’s syndrome have a 10-20 fold increased risk of leukemia. Specifically, they are prone to **AML-M7 (Acute Megakaryoblastic Leukemia)** before age 3, often preceded by Transient Myeloproliferative Disorder (TMD). After age 3, the risk for ALL also increases. * **Klinefelter’s Syndrome (47, XXY):** This syndrome is associated with an increased risk of germ cell tumors (especially mediastinal) and hematological malignancies, including **AML** and non-Hodgkin lymphoma. * **Patau Syndrome (Trisomy 13):** Along with Edwards syndrome (Trisomy 18), Patau syndrome is associated with an increased incidence of neonatal leukemia and AML, though survival is often limited by the severity of the congenital malformations. **Clinical Pearls for NEET-PG:** * **GATA1 Mutation:** This is the characteristic mutation found in Down’s syndrome patients who develop TMD or AML-M7. * **Fanconi Anemia:** The most common inherited bone marrow failure syndrome that progresses to AML. * **Bloom Syndrome & Ataxia-Telangiectasia:** Other DNA repair defect syndromes with a high predisposition to AML. **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. 620.

Question 835: If both parents have sickle cell anemia, what is the likelihood of their offspring having the disease?

A. 0%
B. 25%
C. 50%
D. 100% (Correct Answer)

Explanation: **Explanation:** **1. Understanding the Correct Answer (Option D):** Sickle Cell Anemia (SCA) is an **autosomal recessive** disorder caused by a point mutation in the $\beta$-globin gene (Glu $\to$ Val at the 6th position) [1], [3]. For an individual to manifest the disease (HbSS), they must inherit two defective alleles [2]. In this scenario, both parents have the disease, meaning their genotypes are both **SS**. According to Mendelian inheritance, a cross between two homozygous recessive individuals (SS × SS) will result in offspring that are all **100% SS**. Therefore, every child will have sickle cell anemia. **2. Why Other Options are Incorrect:** * **Option A (0%):** This would only occur if at least one parent had a normal genotype (AA) and the condition was not dominant. * **Option B (25%):** This is the classic risk when **both parents are carriers** (Sickle Cell Trait, AS × AS) [2]. In that case, the ratio is 25% Normal (AA), 50% Trait (AS), and 25% Disease (SS). * **Option C (50%):** This occurs when **one parent has the disease (SS) and the other is a carrier (AS)**. **3. NEET-PG High-Yield Clinical Pearls:** * **Molecular Basis:** A transversion mutation (GAG $\to$ GTG) leads to the substitution of Valine for Glutamic acid [1]. * **Diagnosis:** **Hb Electrophoresis** is the gold standard (HbS migrates slowest toward the anode). Solubility tests and Sodium metabisulfite tests are screening tools. * **Peripheral Smear:** Characterized by sickle cells (drepanocytes) and **Howell-Jolly bodies** (indicating functional asplenia due to repeated splenic infarctions) [1]. * **Complications:** Vaso-occlusive crises, Acute Chest Syndrome, and increased susceptibility to *Salmonella* osteomyelitis [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, pp. 150-151.

Question 836: BCR-ABL gene mutation is seen in which hematological malignancy?

A. Chronic Myeloid Leukemia (CML) (Correct Answer)
B. Acute Myeloid Leukemia (AML)
C. Chronic Lymphocytic Leukemia (CLL)
D. Acute Lymphoblastic Leukemia (ALL)

Explanation: **Explanation:** The **BCR-ABL1** fusion gene is the molecular hallmark of **Chronic Myeloid Leukemia (CML)** [1]. It results from a reciprocal translocation between chromosomes 9 and 22, known as the **Philadelphia chromosome [t(9;22)(q34;q11)]** [2]. This translocation fuses the *ABL1* proto-oncogene (Ch 9) with the *BCR* gene (Ch 22), creating a chimeric protein with constitutive **tyrosine kinase activity** [3]. This leads to uncontrolled proliferation of the myeloid lineage and inhibition of apoptosis. **Analysis of Options:** * **Chronic Myeloid Leukemia (CML):** Correct. BCR-ABL is present in >95% of cases and is essential for diagnosis [1]. * **Acute Myeloid Leukemia (AML):** Incorrect. While rare subtypes (like AML-M1) may show t(9;22), the classic associations for AML are t(8;21), t(15;17), or inv(16). * **Chronic Lymphocytic Leukemia (CLL):** Incorrect. CLL is typically characterized by deletions (13q, 11q, 17p) or Trisomy 12, not BCR-ABL. * **Acute Lymphoblastic Leukemia (ALL):** Incorrect in the context of being the *primary* association. While BCR-ABL is seen in 25-30% of adult ALL (and carries a poor prognosis), it is the defining pathognomonic feature of CML. **High-Yield Clinical Pearls for NEET-PG:** * **Treatment:** Imatinib (a Tyrosine Kinase Inhibitor) is the first-line targeted therapy. * **Leukocyte Alkaline Phosphatase (LAP) Score:** Characteristically **decreased** in CML (helps differentiate it from a Leukemoid reaction where LAP is increased). * **Peripheral Smear:** Shows a "whole spectrum" of myeloid cells (myeloblasts to neutrophils) with a characteristic "bulge" in myelocytes and metamyelocytes. * **Basophilia:** An increase in basophils is a highly specific clue for CML. **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. [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. 225-226. [3] 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. 624-625.

Question 837: Which of the following is the most common hemoglobinopathy?

A. Thalassemia
B. Sickle cell anemia (Correct Answer)
C. Hemoglobin C
D. Spherocytosis

Explanation: **Explanation:** **Sickle Cell Anemia (Option B)** is the correct answer because it is globally recognized as the most common structural hemoglobinopathy [1]. It results from a point mutation in the $\beta$-globin gene where glutamic acid is replaced by valine at the 6th position [1]. This leads to the formation of HbS, which polymerizes under deoxygenated conditions, causing RBC distortion (sickling), hemolysis, and vaso-occlusive crises [1], [2]. **Analysis of Incorrect Options:** * **Thalassemia (Option A):** While highly prevalent, Thalassemia is classified as a quantitative hemoglobinopathy (reduced synthesis of globin chains) rather than a structural one [2]. In many global surveys, Sickle Cell trait/disease has a higher overall carrier frequency. * **Hemoglobin C (Option C):** This is a structural variant where glutamic acid is replaced by lysine at the 6th position of the $\beta$-chain [2]. It is common in West Africa but significantly less prevalent worldwide than HbS [1], [2]. * **Spherocytosis (Option D):** This is a red cell membrane defect (commonly involving Ankyrin or Spectrin), not a hemoglobinopathy. **High-Yield Clinical Pearls for NEET-PG:** * **Inheritance:** Autosomal Recessive. * **Protective Effect:** Heterozygotes (HbAS) are protected against *Plasmodium falciparum* malaria (balanced polymorphism). * **Diagnosis:** HPLC is the gold standard; Sickling test (using Sodium metabisulfite) and Solubility test are screening methods. * **Most common cause of death:** In children, it is *S. pneumoniae* sepsis (due to autosplenectomy); in adults, it is Acute Chest Syndrome [2]. * **Howell-Jolly Bodies:** Seen on peripheral smear due to functional asplenia [2]. **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] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 643-648.

Question 838: A 50-year-old female patient complains of weakness and pain in her back. She has a history of recurrent infections. Laboratory investigations reveal the presence of Bence Jones proteins in her urine. This condition results from the overproduction of abnormal immunoglobulins, which are mostly of which type?

A. IgG (Correct Answer)
B. IgM
C. IgA
D. IgD

Explanation: **Explanation:** The clinical presentation of bone pain, weakness, recurrent infections, and Bence Jones proteinuria in a 50-year-old female is highly suggestive of **Multiple Myeloma (MM)**. This is a plasma cell neoplasm characterized by the monoclonal proliferation of plasma cells in the bone marrow [1]. **1. Why IgG is Correct:** Multiple Myeloma involves the overproduction of a single clone of immunoglobulins (M-protein). **IgG is the most common** isotype produced, accounting for approximately **50-60%** of cases [1, 2]. These abnormal immunoglobulins (and their associated light chains) lead to the classic "CRAB" features: Calcium elevation, Renal insufficiency, Anemia, and Bone lesions [1]. **2. Why Other Options are Incorrect:** * **IgA:** This is the second most common type, seen in about 20% of cases [1]. * **IgM:** Monoclonal IgM is characteristic of **Waldenström Macroglobulinemia**, not Multiple Myeloma [1, 2]. Waldenström's typically presents with hyperviscosity and lymphadenopathy rather than lytic bone lesions. * **IgD:** This is a rare variant (approx. 1-2%) and is often associated with a more aggressive clinical course and a higher incidence of renal failure [1]. **3. NEET-PG High-Yield Pearls:** * **Bence Jones Proteins:** These are free monoclonal **kappa or lambda light chains** that precipitate at 40-60°C and redissolve at 100°C [1]. They are not detected by standard urine dipsticks (which detect albumin) [1]. * **Diagnosis:** Look for "punched-out" lytic lesions on X-ray and "Rouleaux formation" on peripheral smear [1]. * **Bone Marrow:** Characterized by >10% clonal plasma cells; look for "Flame cells" (common in IgA type) or "Mott cells" (grape-like inclusions). * **M-Spike:** Found on Serum Protein Electrophoresis (SPEP), usually in the gamma-globulin region. **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. 606-609. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 616-617.

Question 839: In β-thalassemia, what is the characteristic defect regarding the beta-globin chain?

A. Excess beta chain production
B. Absence of beta chains (Correct Answer)
C. Absence of any globin chains
D. Production of normal beta chains

Explanation: **Explanation:** **Beta-thalassemia** is a quantitative hemoglobinopathy characterized by a reduced or absent synthesis of the $\beta$-globin chains [1]. This is typically caused by point mutations in the $\beta$-globin gene on chromosome 11 [1], [2]. 1. **Why the correct answer is right:** In $\beta^0$-thalassemia, there is a **complete absence** of $\beta$-globin chain production. In $\beta^+$-thalassemia, there is a partial reduction [1]. The hallmark of the disease is the resulting imbalance between $\alpha$ and $\beta$ chains [3]. The relative excess of $\alpha$-chains leads to the formation of insoluble precipitates (Heinz-like bodies) that damage red cell membranes, causing ineffective erythropoiesis and extravascular hemolysis [3]. 2. **Why the incorrect options are wrong:** * **Option A:** Excess $\beta$-chains are seen in $\alpha$-thalassemia (forming HbH or $\beta_4$ tetramers), not $\beta$-thalassemia [2]. * **Option C:** Only the $\beta$-chain is affected; $\alpha$-chain production remains normal (and becomes relatively excessive) [3]. * **Option D:** Production of "normal" chains implies a healthy state. If the chains were structurally abnormal but produced in normal amounts, it would be a qualitative defect (like Sickle Cell Anemia), not thalassemia [4]. **High-Yield Clinical Pearls for NEET-PG:** * **Genetics:** Most commonly due to **point mutations** (Splice site mutations are most frequent) [1], [2]. * **Peripheral Smear:** Microcytic hypochromic anemia with **Target cells** and basophilic stippling. * **Hb Electrophoresis:** Characterized by **increased HbA2 (>3.5%)** and increased HbF [3]. * **Skeletal Changes:** "Crew-cut" appearance on X-ray and "Chipmunk facies" due to compensatory extramedullary hematopoiesis. * **Complication:** Secondary hemochromatosis (iron overload) due to repeated transfusions [3]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 646-647. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, p. 650. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, p. 648. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 587-588.

Question 840: Which of the following is involved in hereditary spherocytosis?

A. Troponin
B. Ankyrin (Correct Answer)
C. Pyrin
D. Actin

Explanation: **Explanation:** **Hereditary Spherocytosis (HS)** is an autosomal dominant disorder characterized by defects in the red blood cell (RBC) membrane skeleton [1]. The primary pathology involves a deficiency or abnormality in proteins that link the inner membrane skeleton to the overlying lipid bilayer [1]. 1. **Why Ankyrin is correct:** **Ankyrin** is the most commonly mutated protein in Hereditary Spherocytosis (involved in ~50-60% of cases). It functions as a "bridge," anchoring **spectrin** (the main skeletal protein) to the transmembrane protein **Band 3** [1]. A defect in Ankyrin leads to a loss of membrane surface area, forcing the RBC to assume a **spherical shape** (spherocyte) to maintain volume. These rigid cells are subsequently trapped and destroyed in the splenic cords, leading to extravascular hemolysis [1]. 2. **Why the other options are incorrect:** * **Troponin:** A regulatory protein complex involved in cardiac and skeletal muscle contraction; it has no structural role in the RBC membrane. * **Pyrin:** A protein involved in the regulation of inflammation (mutated in Familial Mediterranean Fever); it is not a component of the erythrocyte cytoskeleton. * **Actin:** While actin is present in the RBC junctional complex, primary mutations in actin are not a classic or common cause of Hereditary Spherocytosis compared to Ankyrin, Spectrin, or Band 3. **High-Yield Clinical Pearls for NEET-PG:** * **Commonest Protein Defects:** Ankyrin (Most common) > Spectrin > Band 3 > Protein 4.2 [1]. * **Clinical Triad:** Anemia, Jaundice, and Splenomegaly. * **Diagnosis:** Increased **MCHC** (highly characteristic), increased osmotic fragility, and the **EMA Binding Test** (Gold Standard/Most sensitive). * **Complication:** Pigmented gallstones (calcium bilirubinate) and Aplastic crisis (associated with Parvovirus B19) [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 640-642.

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