Cardiac Pathology Practice Questions

Q: Which of the following tumors metastasizes to the heart?

Carcinoma of the breast. **Explanation:** Metastatic involvement of the heart is significantly more common than primary cardiac tumors (ratio of approximately 30:1). While any malignant tumor can spread to the heart, certain cancers show a higher predilection due to anatomical proximity or lymphatic/hematogenous pathways [1]. **Why Option A is Correct:** **Carcinoma of the breast** is one of the most common tumors to metastasize to the heart, alongside lung cancer, melanoma, and lymphomas [1]. The heart is involved in approximately 10% of fatal cases of breast cancer. The spread typically occurs via **direct extension** or **retrograde lymphatic spread** through the mediastinal lymph nodes, often involving the pericardium first, leading to pericardial effusion [1]. **Why Other Options are Incorrect:** * **B & C (Stomach and Urinary Bladder):** While these carcinomas can metastasize hematogenously, they rarely involve the heart. Their primary sites of metastasis are typically the liver, lungs, or regional lymph nodes. * **D (Osteogenic Sarcoma):** Although sarcomas can spread hematogenously to the lungs, cardiac involvement is rare compared to the high frequency seen in breast and lung malignancies. **High-Yield NEET-PG Pearls:** * **Most common primary cardiac tumor (Adults):** Myxoma (usually in the left atrium). * **Most common primary cardiac tumor (Children):** Rhabdomyoma (associated with Tuberous Sclerosis). * **Most common tumor to metastasize to the heart:** Lung cancer (due to proximity) [1]. * **Tumor with the highest *rate* of cardiac metastasis:** Malignant Melanoma (up to 50% of cases involve the heart) [1]. * **Clinical Presentation:** Most cardiac metastases are clinically silent, but the most common manifestation is **pericardial effusion** [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 584-586.

Q: Antischkow cells are characteristic of which of the following conditions?

Acute rheumatic fever. **Explanation:** **Anitschkow cells** (also known as "caterpillar cells") are pathognomonic for **Acute Rheumatic Fever (ARF)** [1]. These are specialized activated macrophages found within **Aschoff bodies**, which are the characteristic granulomatous lesions of rheumatic carditis [1]. 1. **Why Option A is correct:** In ARF, these macrophages exhibit abundant cytoplasm and a central nucleus with chromatin condensed into a slender, wavy ribbon, resembling a caterpillar when viewed longitudinally [1]. If viewed in cross-section, they may appear as "owl-eye" cells. Their presence within Aschoff bodies across the three layers of the heart (pancarditis) confirms the diagnosis of rheumatic heart disease. 2. **Why the other options are incorrect:** * **Yellow Fever:** Characterized by **Councilman bodies** (acidophilic/apoptotic hepatocytes). * **Malarial Spleen:** Associated with **Durck’s granulomas** (in the brain) and massive splenomegaly with slate-grey discoloration due to hemozoin pigment. * **ITP:** Characterized by increased megakaryocytes in the bone marrow and peripheral destruction of platelets; it does not involve Anitschkow cells. **High-Yield Pearls for NEET-PG:** * **Aschoff Bodies:** These represent the pathognomonic histological hallmark of ARF. They consist of T-cells, plasma cells, and Anitschkow cells [1]. * **MacCallum Patch:** A subendocardial thickening, usually in the left atrium, caused by regurgitant jets in ARF. * **Molecular Mimicry:** The underlying pathogenesis of ARF involves Type II hypersensitivity where antibodies against Group A Streptococcal M-protein cross-react with cardiac myosin [1]. * **Bread and Butter Pericarditis:** The classic gross appearance of the pericardium in ARF. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 566-567.

Q: Histopathology of mitral valve prolapse typically shows which of the following changes?

Myxomatous degeneration. **Explanation:** **Mitral Valve Prolapse (MVP)**, also known as Barlow syndrome, is the most common cause of mitral regurgitation requiring surgery. **Why Option A is correct:** The hallmark histological feature of MVP is **Myxomatous degeneration**. This process involves the pathological accumulation of **glycosaminoglycans (dermatan sulfate)** within the middle layer of the valve (the *stratum spongiosa*). This causes the spongiosa to thicken and encroach upon the *fibrosa* layer, weakening the structural integrity of the valve [1]. Consequently, the leaflets become enlarged, redundant, and "floppy," causing them to balloon (prolapse) into the left atrium during systole [1]. **Why the other options are incorrect:** * **B. Fibrinoid degeneration:** This is characteristic of **Rheumatic Heart Disease (Aschoff bodies)** or collagen vascular diseases like SLE (Libman-Sacks endocarditis), not MVP [1]. * **C. Granulomatous inflammation:** This suggests a chronic inflammatory process like Sarcoidosis or Tuberculosis. MVP is a non-inflammatory, degenerative structural change. * **D. Fibrous thickening:** While secondary fibrosis can occur due to mechanical stress, the *primary* underlying pathology in MVP is the loss of collagenous integrity due to myxomatous change. **High-Yield Clinical Pearls for NEET-PG:** * **Auscultation:** Characterized by a **Mid-systolic click** followed by a late systolic murmur. * **Associations:** Frequently associated with connective tissue disorders like **Marfan Syndrome** and Ehlers-Danlos Syndrome. * **Gross Appearance:** "Hooding" or "Ballooning" of the leaflets with elongated, thinned chordae tendineae. * **Complications:** Infective endocarditis, sudden cardiac death (rare), and chordae rupture. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 572.

Q: Which of the following is NOT an effect of aging on the myocardium?

Decreased mass. ### Explanation The correct answer is **A. Decreased mass**. In the aging heart, the most characteristic change is actually an **increase in myocardial mass**, primarily due to compensatory hypertrophy of myocytes [1]. As myocytes are lost over time (apoptosis/necrosis), the remaining cells undergo hypertrophy to maintain cardiac output, often leading to a "sigmoid-shaped" ventricular septum. **Analysis of Options:** * **A. Decreased mass (Correct):** Aging typically leads to **increased** ventricular wall thickness and mass [1]. A decrease in mass is generally pathological (e.g., end-stage dilated cardiomyopathy) rather than a physiological aging process. * **B. Increased subepicardial fat:** With age, there is a progressive accumulation of adipose tissue in the subepicardium, particularly over the right ventricle. This is a classic morphological hallmark of the aging heart. * **C. Brown atrophy:** This term describes the gross appearance of the heart in elderly or cachectic individuals. It occurs when the heart shrinks slightly in volume (though mass often remains stable or increases due to hypertrophy) and takes on a brownish hue. * **D. Lipofuscin deposition:** Known as the "wear-and-tear" pigment, lipofuscin is a product of lipid peroxidation. It accumulates in the perinuclear region of myocytes as a result of aging and is the microscopic basis for brown atrophy. **High-Yield NEET-PG Pearls:** * **Basophilic degeneration:** A common aging change where gray-blue byproduct of glycogen metabolism accumulates in myocytes. * **Amyloidosis:** Senile systemic amyloidosis (transthyretin-derived) is frequently found in the hearts of patients >80 years. * **Valvular changes:** Calcification of the aortic valve and mitral annulus are the most common valvular findings in the elderly. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 536.

Q: Carcinoid syndrome produces valvular disease primarily of which valve?

Tricuspid valve. **Explanation:** **Core Concept:** Carcinoid heart disease occurs in patients with systemic carcinoid syndrome (usually from metastatic neuroendocrine tumors of the midgut). The pathology is driven by the release of vasoactive substances, primarily **Serotonin (5-HT)**, into the systemic circulation. These substances stimulate fibroblast proliferation, leading to characteristic **pearly-white, plaque-like fibrous thickenings** on the endocardial surfaces [1]. **Why the Tricuspid Valve?** The **Tricuspid valve** (and Pulmonary valve) is primarily affected because these substances reach the right side of the heart first via the vena cava. Serotonin causes the valve leaflets to become thickened, rigid, and shortened, typically resulting in **Tricuspid Regurgitation** [1]. **Why other options are incorrect:** * **Mitral and Aortic Valves (Left-sided):** These are generally spared because the **lungs contain monoamine oxidase (MAO)**, which inactivates serotonin and other mediators before they can reach the left atrium. Left-sided involvement only occurs in cases of a Right-to-Left shunt (e.g., PFO) or primary bronchial carcinoids. * **Venous Valves:** While the mediators travel through the veins, they do not cause significant valvular pathology in the peripheral venous system; the endocardial surface of the heart is the primary target for plaque deposition. **High-Yield NEET-PG Pearls:** * **Pathognomonic Lesion:** "Pearly-white fibrous plaques" composed of smooth muscle cells and collagen in an acid mucopolysaccharide matrix [1]. * **Biomarker:** Elevated urinary **5-HIAA** (metabolite of serotonin) is used for diagnosis. * **Mnemonic:** **TIPS** (Tricuspid Insufficiency, Pulmonary Stenosis) – the classic right-sided findings in Carcinoid [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 570-572.

Question 1

Which of the following tumors metastasizes to the heart?

Accepted Answer

Carcinoma of the breast

Answer

Carcinoma of the stomach

Answer

Carcinoma of the urinary bladder

Answer

Osteogenic sarcoma

Question 2

Antischkow cells are characteristic of which of the following conditions?

Accepted Answer

Acute rheumatic fever

Answer

Yellow fever

Answer

Malarial spleen

Answer

Idiopathic thrombocytopenic purpura (ITP)

Question 3

Following myocardial infarction (MI), staining of cardiac tissue with TTC within 12 hours of infarction showed red color. In which area is this red color seen?

Accepted Answer

In the non-infarcted area due to presence of lactate dehydrogenase (LDH)

Answer

In the infarcted area due to loss of lactate dehydrogenase (LDH)

Answer

In the infarcted area due to loss of creatine kinase

Answer

In the non-infarcted area due to presence of creatine kinase

Question 4

Histopathology of mitral valve prolapse typically shows which of the following changes?

Accepted Answer

Myxomatous degeneration

Answer

Fibrinoid degeneration

Answer

Granulomatous inflammation

Answer

Fibrous thickening

Question 5

Which of the following is NOT an effect of aging on the myocardium?

Accepted Answer

Decreased mass

Answer

Increased subepicardial fat

Answer

Brown atrophy

Answer

Lipofuscin deposition

Question 6

Irreversible injury to myocardium in myocardial infarction occurs earliest by which time duration?

Accepted Answer

20 minutes

Answer

Few seconds

Answer

10 minutes

Answer

40 minutes

Question 7

What is the characteristic pathological finding in carcinoid heart disease?

Accepted Answer

Fibrous endocardial thickening of the right ventricle, tricuspid valve, and pulmonary valve

Answer

Endocardial thickening of the tricuspid valve with severe tricuspid stenosis

Answer

Collagen-rich, elastic deposits in the endocardium of the right ventricle and pulmonary valve

Answer

Calcification of the tricuspid and pulmonary valves

Question 8

Concentric hypertrophy of the left ventricle is seen in which of the following conditions?

Accepted Answer

Hypertension

Answer

Mitral stenosis

Answer

Aortic regurgitation

Answer

None of the above

Question 9

All are true about hyperopic obstructive cardiomyopathy except?

Accepted Answer

Dilatation of ventricles

Answer

Asymmetric septal hypertrophy

Answer

Dilatation of atria

Answer

Outflow obstruction

Question 10

Carcinoid syndrome produces valvular disease primarily of which valve?

Accepted Answer

Tricuspid valve

Answer

Venous valves

Answer

Mitral valve

Answer

Aortic valve

Cardiac Pathology — MCQs

Cardiac Pathology — MCQs

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