Cardiac Pathology — MCQs
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A 59-year-old man presents with acute chest pain. Laboratory studies and ECG indicate an acute myocardial infarction. Coronary angiography performed 2 hours later does not show evidence of thrombosis. Intravascular thrombolysis in this patient was mediated by plasminogen activators released by which of the following cells?
What is the most common tumor of heart valves?
Concentric hypertrophy of the heart is seen in which of the following conditions?
A 30-year-old woman with a history of intravenous drug abuse presents with rapidly progressive malaise, fever, and chills. Physical examination reveals subungual splinter hemorrhages and a systolic murmur. Blood cultures are positive for Staphylococcus aureus. The patient died of myocardial infarction on her third hospital day. What was the underlying condition that led to the patient's demise?
What is the characteristic pathological finding in carcinoid of the heart?
Restrictive cardiomyopathy is seen in which of the following conditions?
"Lipidic cells" are seen in which of the following conditions?
A 56-year-old male patient presented with sudden substernal pain and a sense of impending doom, and died 4 days later. Autopsy revealed a large transmural anterior wall infarction. What would be associated with this finding?
An adult presents to a physician because of repeated episodes of fainting. EKG fails to disclose an arrhythmia. Echocardiogram shows a mass in the left atrium that is acting like a "ball valve" to produce intermittent obstruction of flow. Which of the following would most likely be seen on microscopic examination of the resected mass?
In which of the following conditions are Aschoff bodies observed?
Cardiac Pathology Indian Medical PG Practice Questions and MCQs
Question 161: A 59-year-old man presents with acute chest pain. Laboratory studies and ECG indicate an acute myocardial infarction. Coronary angiography performed 2 hours later does not show evidence of thrombosis. Intravascular thrombolysis in this patient was mediated by plasminogen activators released by which of the following cells?
- A. Cardiac myocytes
- B. Endothelial cells (Correct Answer)
- C. Macrophages
- D. Vascular smooth muscle cells
Explanation: ### Explanation **Correct Answer: B. Endothelial cells** **Mechanism and Concept:** The scenario describes a phenomenon known as **spontaneous thrombolysis**. In the early stages of an acute myocardial infarction (AMI), a thrombus typically occludes the coronary artery. However, the body possesses an innate fibrinolytic system to counteract thrombosis. The key enzyme in this process is **Plasmin**, which degrades fibrin [1]. Plasmin is derived from its inactive precursor, plasminogen, via **Tissue-type Plasminogen Activator (t-PA)** [1]. The primary source of endogenous t-PA is the **vascular endothelial cells** [1]. When stimulated by stasis or occlusion, these cells release t-PA, which converts plasminogen to plasmin, leading to the dissolution of the clot [1]. This explains why angiography performed shortly after an MI may sometimes show no evidence of a thrombus despite clinical evidence of infarction. **Analysis of Incorrect Options:** * **A. Cardiac myocytes:** While myocytes are the victims of ischemic injury in MI, they do not produce fibrinolytic enzymes. They release biomarkers like Troponin and CK-MB upon necrosis. * **C. Macrophages:** Macrophages are involved in the inflammatory response and healing phase (clearing debris) starting 3–7 days post-MI, but they are not the primary source of plasminogen activators for acute thrombolysis. * **D. Vascular smooth muscle cells:** These cells are responsible for structural integrity and vasoconstriction/dilation (vasospasm) but do not play a significant role in the fibrinolytic pathway. **NEET-PG High-Yield Pearls:** * **t-PA vs. Streptokinase:** t-PA is "fibrin-specific" (acts mainly at the site of the clot), whereas Streptokinase (derived from bacteria) causes systemic fibrinolysis [1]. * **Timeframe:** Endogenous thrombolysis occurs in approximately 10–20% of patients within the first few hours of an MI. * **Endothelial Function:** Endothelial cells maintain a thrombo-resistant phenotype by secreting **t-PA**, **Prostacyclin (PGI2)**, and **Nitric Oxide (NO)** [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, pp. 130-132.
Question 162: What is the most common tumor of heart valves?
- A. Papillary fibroelastoma (Correct Answer)
- B. Malignant fibrous histiocytoma
- C. Angiosarcoma
- D. Rhabdomyosarcoma
Explanation: **Explanation:** **1. Why Papillary Fibroelastoma is correct:** Papillary fibroelastoma is the **most common primary tumor of the heart valves**. While myxoma is the most common primary cardiac tumor overall, it typically arises from the atrial septum [1], [2]. In contrast, papillary fibroelastomas are small, sea-anemone-like growths found predominantly on valvular endocardium (most commonly the **aortic valve**, followed by the mitral valve). Histologically, they consist of a core of dense connective tissue surrounded by elastic fibers and covered by surface endothelium. Their clinical significance lies in their potential to embolize, leading to strokes or myocardial infarction. **2. Why the other options are incorrect:** * **Malignant Fibrous Histiocytoma:** This is a high-grade pleomorphic sarcoma. While it can occur in the heart (usually the left atrium), it is rare and not specific to valves. * **Angiosarcoma:** This is the **most common primary malignant tumor** of the heart in adults. It typically arises in the **right atrium**, not the valves, and has a very poor prognosis. * **Rhabdomyosarcoma:** This is the most common primary cardiac malignancy in **children** [2]. Like other sarcomas, it involves the myocardium rather than the valvular structures. **3. NEET-PG High-Yield Pearls:** * **Most common primary cardiac tumor (Adults):** Myxoma (usually Left Atrium) [1], [2]. * **Most common primary cardiac tumor (Children):** Rhabdomyoma (associated with Tuberous Sclerosis) [2]. * **Most common tumor of the heart (Overall):** Metastatic tumors (from lung, breast, or melanoma). * **Most common tumor of Heart Valves:** Papillary Fibroelastoma. * **Key Histology:** Papillary fibroelastomas are often described as having "frond-like" projections. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 583-584. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Cardiovascular Disease, pp. 304-306.
Question 163: Concentric hypertrophy of the heart is seen in which of the following conditions?
- A. Mitral stenosis
- B. Mitral regurgitation
- C. Hypertension (Correct Answer)
- D. Aortic regurgitation
Explanation: ### Explanation **Correct Answer: C. Hypertension** **Mechanism of Concentric Hypertrophy:** Concentric hypertrophy is a response to **pressure overload** [1]. When the heart faces increased systemic resistance (as in systemic hypertension or aortic stenosis), the ventricular wall thickens to maintain wall stress according to Laplace’s Law ($Wall\ Stress = \frac{Pressure \times Radius}{2 \times Wall\ Thickness}$) [3]. * **Pathology:** New sarcomeres are added in **parallel**, leading to an increase in wall thickness and a **decrease in ventricular cavity size** [1]. **Analysis of Incorrect Options:** * **B. Mitral Regurgitation & D. Aortic Regurgitation:** These conditions cause **volume overload** [1]. To accommodate the excess blood volume, the heart undergoes **eccentric hypertrophy**. In this process, new sarcomeres are added in **series**, leading to chamber dilation and proportional wall thinning [1]. * **A. Mitral Stenosis:** This condition primarily affects the left atrium (causing left atrial dilation and hypertrophy). The left ventricle usually remains normal in size or may even undergo atrophy because it is "protected" from volume/pressure by the stenotic valve. **High-Yield Clinical Pearls for NEET-PG:** * **Pressure Overload → Concentric Hypertrophy** (e.g., Hypertension, Aortic Stenosis) [1]. * **Volume Overload → Eccentric Hypertrophy** (e.g., Regurgitant lesions, Dilated Cardiomyopathy, Physiological adaptation in athletes) [1]. * **Microscopic Hallmark:** Enlarged, rectangular "box-car" nuclei in myocytes [3]. * **Consequence:** Concentric hypertrophy leads to **diastolic heart failure** (HFpEF) due to reduced ventricular compliance [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 536. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 560-562. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 45-46.
Question 164: A 30-year-old woman with a history of intravenous drug abuse presents with rapidly progressive malaise, fever, and chills. Physical examination reveals subungual splinter hemorrhages and a systolic murmur. Blood cultures are positive for Staphylococcus aureus. The patient died of myocardial infarction on her third hospital day. What was the underlying condition that led to the patient's demise?
- A. Acute infective endocarditis (Correct Answer)
- B. Carcinoid heart disease
- C. Libman-Sacks endocarditis
- D. Nonbacterial thrombotic endocarditis
Explanation: **Explanation:** The clinical presentation is a classic case of **Acute Infective Endocarditis (IE)**. The patient exhibits the hallmark "triad" of IV drug abuse (IVDA), rapid onset of systemic symptoms (fever, chills), and peripheral embolic phenomena (splinter hemorrhages) [2]. **Why Option A is correct:** * **Pathogenesis:** *Staphylococcus aureus* is a highly virulent organism and the most common cause of acute IE, especially in IVDA patients [1]. Unlike subacute IE, acute IE can attack previously **normal heart valves** [1]. * **Complications:** The patient died of a myocardial infarction (MI). In IE, large, friable vegetations can break off (systemic embolization) [3]. If an embolus occludes a coronary artery, it leads to an MI. This explains the rapid demise. **Why other options are incorrect:** * **B. Carcinoid heart disease:** Characterized by plaque-like endocardial thickening of the right heart (tricuspid/pulmonary valves) due to bioactive amines (serotonin). It does not present with acute fever or splinter hemorrhages. * **C. Libman-Sacks endocarditis:** Associated with SLE. It features small, sterile vegetations on *both* sides of the valves [3]. It typically does not cause acute systemic sepsis or large embolic MIs. * **D. Nonbacterial thrombotic endocarditis (NBTE):** Seen in wasted states (marantic endocarditis) or cancers. While it can embolize, it is non-inflammatory (no fever) and not associated with *S. aureus* bacteremia [3]. **High-Yield Clinical Pearls for NEET-PG:** * **Most common valve in IVDA:** Tricuspid valve (Right-sided IE). * **Most common organism in IVDA:** *Staphylococcus aureus* [1]. * **Janeway Lesions:** Painless, erythematous macules on palms/soles (embolic). * **Osler Nodes:** Painful, pea-sized nodules on finger/toe pads (immune complex-mediated) [4]. * **Roth Spots:** Retinal hemorrhages with pale centers. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 567-568. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 568-570. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 568. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Cardiovascular Disease, pp. 296-297.
Question 165: What is the characteristic pathological finding in carcinoid of the heart?
- A. Fibrous endocardial thickening of the right ventricle and tricuspid valve (Correct Answer)
- B. Collagen deposition in the wall of the right ventricle and tricuspid valve
- C. Interstitial fibrous thickening of the right ventricle and pulmonic valve
- D. Mononuclear inflammatory infiltrate in the wall of the right atrium
Explanation: **Explanation:** **Carcinoid Heart Disease** is a manifestation of systemic carcinoid syndrome, typically occurring when neuroendocrine tumors (usually from the midgut) metastasize to the liver. These tumors release bioactive substances like **serotonin (5-HT)**, bradykinin, and histamine into the systemic circulation. **1. Why Option A is Correct:** The hallmark of carcinoid heart disease is the formation of **glistening, white, plaque-like fibrous thickenings** on the endocardial surfaces [1]. These plaques are composed of smooth muscle cells and sparse collagen embedded in an acid mucopolysaccharide-rich matrix [1]. Crucially, they affect the **right side of the heart** (tricuspid valve and right ventricle) because the lungs contain **monoamine oxidase (MAO)**, which degrades serotonin before it can reach the left heart. **2. Why the Other Options are Incorrect:** * **Option B:** While collagen is present, the primary pathology is **endocardial thickening** (plaques) rather than simple deposition within the muscular wall of the ventricle [1]. * **Option C:** The lesions are endocardial, not interstitial [1]. While the pulmonic valve is often involved, the tricuspid valve is the most common site of significant regurgitation. * **Option D:** Carcinoid heart disease is a non-inflammatory, biochemical-mediated fibrotic process; it does not present with a primary mononuclear inflammatory infiltrate. **High-Yield Clinical Pearls for NEET-PG:** * **Localization:** Right heart involvement is the rule. Left heart involvement is rare and suggests either a **patent foramen ovale (PFO)** or a **primary bronchial carcinoid** (where serotonin bypasses the lungs). * **Clinical Sign:** The most common valvular lesions are **Tricuspid Regurgitation (TR)** and **Pulmonary Stenosis (PS)** [1]. * **Diagnostic Marker:** Elevated urinary **5-HIAA** (5-hydroxyindoleacetic acid) is the gold standard for diagnosing carcinoid syndrome. * **Pathogenesis:** Serotonin stimulates fibroblast proliferation via 5-HT2B receptors. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 570-572.
Question 166: Restrictive cardiomyopathy is seen in which of the following conditions?
- A. Amyloidosis (Correct Answer)
- B. Fatty change of the heart
- C. Viral myocarditis
- D. Doxorubicin toxicity
Explanation: **Explanation:** **Restrictive Cardiomyopathy (RCM)** is characterized by a primary decrease in ventricular compliance, resulting in impaired ventricular filling during diastole (diastolic dysfunction) [1]. The ventricles are of normal size or slightly enlarged, but the myocardium is firm and non-compliant [1]. **Why Amyloidosis is correct:** **Amyloidosis** is the most common cause of restrictive cardiomyopathy [1]. It involves the extracellular deposition of amyloid proteins (e.g., transthyretin or light chains) within the myocardial interstitium [1]. these deposits make the heart wall stiff and "rubbery," directly impeding relaxation and filling. On echocardiography, this often presents with a characteristic "speckled" or "granular" appearance of the myocardium [1]. **Why the other options are incorrect:** * **Fatty change of the heart:** This typically occurs due to chronic hypoxia or toxins (e.g., "tigered heart" in severe anemia). It does not cause a restrictive pattern; rather, it leads to weakened contractility. * **Viral myocarditis:** This is an inflammatory process that most commonly leads to **Dilated Cardiomyopathy (DCM)** due to myocyte necrosis and subsequent ventricular enlargement [3]. * **Doxorubicin toxicity:** This anthracycline chemotherapy agent causes dose-dependent cardiotoxicity, leading to myofibrillar loss and vacuolization, ultimately resulting in **Dilated Cardiomyopathy** [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Other causes of RCM:** Sarcoidosis, Hemochromatosis [1], Endomyocardial Fibrosis (Davies disease), and Loeffler endomyocarditis (associated with eosinophilia). * **Key Diagnostic Feature:** Biatrial dilatation is a classic finding in RCM because the atria must work harder to pump blood into the stiff ventricles [1]. * **Kussmaul’s Sign:** May be positive in RCM (paradoxical rise in JVP during inspiration). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 580-581. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Cardiovascular Disease, pp. 302-303. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 574-576.
Question 167: "Lipidic cells" are seen in which of the following conditions?
- A. Myxoma of the heart (Correct Answer)
- B. Lepromatous leprosy
- C. Rhabdomyoma
- D. Rheumatic heart disease
Explanation: **Explanation:** **Correct Answer: A. Myxoma of the heart** Atrial myxomas are the most common primary tumors of the heart in adults [1, 2]. Histologically, they are characterized by a multinodular, gelatinous appearance. The hallmark microscopic feature is the presence of **"Lepidic cells"** (also called myxoma cells) [1]. These are stellate or globular cells with abundant eosinophilic cytoplasm and oval nuclei, often arranged in small clusters, cords, or syncytium-like structures within a loose, acid mucopolysaccharide-rich (myxoid) stroma [1]. **Analysis of Incorrect Options:** * **B. Lepromatous leprosy:** This condition is characterized by **Virchow cells** (lepra cells), which are foamy macrophages containing large numbers of acid-fast bacilli (*M. leprae*). * **C. Rhabdomyoma:** The most common primary cardiac tumor in children [2]. Its characteristic histological feature is the **"Spider cell"**—large, clear cells containing glycogen vacuoles with radial cytoplasmic strands extending to the cell membrane. * **D. Rheumatic heart disease:** The pathognomonic feature is the **Aschoff body**, which contains **Anitschkow cells** (caterpillar cells) and multinucleated Aschoff giant cells. **NEET-PG High-Yield Pearls:** * **Location:** 75–90% of myxomas occur in the **left atrium**, specifically at the fossa ovalis [1, 2]. * **Clinical Presentation:** Often presents with "Wrecking-ball effect" (mitral valve obstruction) or systemic embolization [1, 2]. * **Carney Complex:** An autosomal dominant syndrome (PRKAR1A mutation) involving cardiac myxomas, skin pigmentation (lentigines), and endocrine overactivity. * **Diagnosis:** Echocardiography is the gold standard for initial identification. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 583-584. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Cardiovascular Disease, pp. 304-306.
Question 168: A 56-year-old male patient presented with sudden substernal pain and a sense of impending doom, and died 4 days later. Autopsy revealed a large transmural anterior wall infarction. What would be associated with this finding?
- A. Presence of collagen and fibroblasts
- B. Presence of neutrophils (Correct Answer)
- C. Granulomatous inflammation
- D. Granulation tissue
Explanation: ### Explanation The correct answer is **B. Presence of neutrophils**. This question tests your knowledge of the **temporal evolution of Myocardial Infarction (MI)** [1]. The histological changes in the myocardium follow a predictable timeline after an ischemic event: 1. **0–24 hours:** Early changes include wavy fibers and contraction band necrosis, followed by the beginning of coagulative necrosis [1]. 2. **1–3 days:** Extensive coagulative necrosis occurs, accompanied by a **dense infiltrate of neutrophils** [1]. This is the peak period for acute inflammation. 3. **3–7 days:** Neutrophils begin to undergo apoptosis and are replaced by **macrophages**, which start phagocytosing the dead myocytes [1]. 4. **7–14 days:** **Granulation tissue** (characterized by new capillaries and fibroblasts) becomes prominent. 5. **2 weeks–2 months:** Increased collagen deposition leads to the formation of a dense **collagenous scar**. In this case, the patient died **4 days** after the onset of symptoms. While macrophages are entering the scene, the transition from the acute inflammatory phase (neutrophils) to the proliferative phase is still in its early stages. In the context of the options provided, neutrophils represent the most characteristic finding of the early post-infarct period (1–4 days) [1]. **Why other options are incorrect:** * **A & D (Collagen/Fibroblasts/Granulation tissue):** These are features of the healing phase, typically appearing after the first week (7–14 days). * **C (Granulomatous inflammation):** This is a feature of chronic infections (like TB) or sarcoidosis, not myocardial infarction. ### NEET-PG High-Yield Pearls: * **Most common cause of death (0–24 hrs):** Arrhythmias. * **Most common cause of death (3–7 days):** Myocardial rupture (Free wall rupture → Tamponade; Septal rupture → VSD; Papillary muscle rupture → Mitral Regurgitation) because the tissue is softest ("yellow softening") during macrophage infiltration [3]. * **Stain for early MI (before 12 hrs):** Triphenyltetrazolium chloride (TTC) – infarcted area remains unstained (pale) [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 552. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 552-554. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 556-557.
Question 169: An adult presents to a physician because of repeated episodes of fainting. EKG fails to disclose an arrhythmia. Echocardiogram shows a mass in the left atrium that is acting like a "ball valve" to produce intermittent obstruction of flow. Which of the following would most likely be seen on microscopic examination of the resected mass?
- A. Benign myxoid tumor (Correct Answer)
- B. Benign tumor with gland formation
- C. Benign tumor with striated muscle differentiation
- D. Malignant tumor with gland formation
Explanation: ### Explanation The clinical presentation of repeated fainting (syncope) associated with a "ball-valve" obstruction in the left atrium is a classic description of an **Atrial Myxoma** [1], [2]. **1. Why Option A is Correct:** Atrial myxoma is the most common primary cardiac tumor in adults [2]. Approximately 75-80% occur in the **left atrium**, typically attached to the interatrial septum at the fossa ovalis [1]. Microscopically, these are **benign myxoid tumors** characterized by "myxoma cells" (stellate or spindle-shaped cells) embedded in an abundant acid mucopolysaccharide (myxoid) extracellular matrix [1]. The "ball-valve" effect occurs when the pedunculated mass intermittently obstructs the mitral valve orifice, leading to sudden drops in cardiac output and syncope [1]. **2. Why Other Options are Incorrect:** * **Option B & D:** Gland formation is characteristic of metastatic adenocarcinoma. While the heart can be a site for metastasis, primary cardiac tumors with glandular differentiation are not the standard presentation for a pedunculated left atrial mass. * **Option C:** Striated muscle differentiation is seen in **Rhabdomyomas** [2]. These are the most common primary cardiac tumors in **children** (often associated with Tuberous Sclerosis) and typically present as multiple intramural ventricular masses rather than a pedunculated atrial mass [2]. **3. High-Yield Clinical Pearls for NEET-PG:** * **Clinical Triad:** Constitutional symptoms (fever, weight loss due to IL-6 release), Embolic phenomena (fragmentation of the tumor), and Obstructive symptoms (mimicking mitral stenosis). * **Auscultation:** A characteristic **"Tumor Plop"** may be heard during diastole as the mass drops into the mitral orifice. * **Carney Complex:** An autosomal dominant syndrome (PRKAR1A mutation) featuring atrial myxomas, spotty skin pigmentation (lentigines), and endocrine overactivity. * **Diagnosis:** Echocardiography is the gold standard for initial identification. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 583-584. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Cardiovascular Disease, pp. 304-306.
Question 170: In which of the following conditions are Aschoff bodies observed?
- A. Acute myelogenous leukemia
- B. Pheochromocytoma
- C. Osteopetrosis
- D. Rheumatic fever (Correct Answer)
Explanation: **Explanation:** **Aschoff bodies** are the pathognomonic histological hallmark of **Acute Rheumatic Fever (ARF)** [1]. They represent areas of focal interstitial inflammation found in all three layers of the heart (pancarditis), though they are most common in the myocardium [1]. 1. **Why Rheumatic Fever is correct:** Aschoff bodies are granulomatous structures consisting of a central zone of fibrinoid necrosis surrounded by chronic inflammatory cells (lymphocytes, plasma cells) and characteristic **Anitschkow cells** (caterpillar cells) [1]. These are plump activated macrophages with wavy, ribbon-like chromatin [1]. As these lesions age, they fibrose to form Aschoff scars. 2. **Why other options are incorrect:** * **Acute Myelogenous Leukemia (AML):** Characterized by the presence of **Auer rods** (clumped granular material) in the cytoplasm of myeloblasts, not Aschoff bodies. * **Pheochromocytoma:** A catecholamine-secreting tumor of the adrenal medulla. Histologically, it shows a **Zellballen pattern** (nested clusters of cells). * **Osteopetrosis:** A genetic disorder of defective osteoclast function leading to "marble bone disease." It is characterized by thickened, dense bone with a lack of medullary canals. **High-Yield Clinical Pearls for NEET-PG:** * **Anitschkow Cells:** Large macrophages with "caterpillar-like" nuclei; when seen in cross-section, they are called **Owl-eye cells** [1]. * **Location:** Aschoff bodies are most frequently found in the **subendocardium** and **myocardium** [1]. * **MacCallum Patch:** A map-like area of subendocardial thickening, usually in the left atrium, caused by regurgitant jets in Rheumatic Heart Disease. * **Jones Criteria:** Used for the clinical diagnosis of ARF (Major: Joint, Carditis, Nodules, Erythema marginatum, Sydenham chorea). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 566-567.
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Congenital Heart Disease
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Hypertensive Heart Disease
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Valvular Heart Disease
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Pericardial Disease
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Cardiac Tumors
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Heart Failure Pathophysiology
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Cardiac Transplantation Pathology
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Endocarditis
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