Cardiac Pathology Practice Questions

Q: Vegetations on the under-surface of Aortic valve leaflets are typically found in which condition?

Libman-Sacks endocarditis. **Explanation:** **Libman-Sacks Endocarditis (LSE)**, also known as verrucous endocarditis, is the characteristic cardiac manifestation of Systemic Lupus Erythematosus (SLE). The hallmark of LSE is the presence of small, sterile, pinkish vegetations that can occur **anywhere on the valve surface** [2]. Uniquely, these vegetations are frequently found on the **under-surface of the leaflets** (ventricular surface of semilunar valves or atrial surface of AV valves), the chordae tendineae, and the endocardial surfaces [1]. **Analysis of Options:** * **Acute Rheumatic Carditis:** Vegetations (verrucae) are small, sterile, and friable, but they occur strictly along the **lines of closure** on the atrial surface of AV valves [2]. * **Non-Bacterial Thrombotic Endocarditis (NBTE):** These are sterile, bland thrombi usually found in hypercoagulable states (e.g., Trousseau syndrome). Like rheumatic fever, they are typically restricted to the **lines of valve closure** [2]. * **Chronic Rheumatic Carditis:** This stage is characterized by valve thickening, commissural fusion ("fish-mouth" deformity), and calcification rather than active vegetations. **High-Yield NEET-PG Pearls:** * **Location Trick:** If the question mentions "both sides of the valve" or "under-surface," think **Libman-Sacks (SLE)**. * **Pathology:** LSE vegetations consist of immune complexes, fibrin, and "hematoxylin bodies" (the tissue equivalent of LE cells). * **Clinical:** While usually asymptomatic, LSE can lead to valvular regurgitation or embolic events. * **Most Common Valve:** Mitral valve is most frequently involved in all forms of non-infective endocarditis [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 570. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 568.

Q: Which of the following forms of ischemic heart disease manifests with slowly progressive heart failure, with or without other clinical manifestations of myocardial ischemia?

Chronic ischemic heart disease. **Explanation:** **Chronic Ischemic Heart Disease (CIHD)**, also known as ischemic cardiomyopathy, refers to a clinical syndrome characterized by progressive heart failure resulting from chronic, long-term ischemic myocardial damage [1]. In these patients, the cumulative effect of multiple small infarcts or chronic hypoperfusion leads to the replacement of functional myocardium with fibrous tissue. This results in ventricular dilation and systolic dysfunction, manifesting as **slowly progressive heart failure**, even in the absence of acute episodes of chest pain [1]. **Analysis of Incorrect Options:** * **Myocardial Infarction (MI):** This is an acute event caused by sudden coronary occlusion leading to myocardial necrosis [3]. It presents with sudden-onset crushing chest pain and acute complications, rather than a slow, insidious progression [4]. * **Prinzmetal Angina:** This is a form of unstable angina caused by coronary artery vasospasm. It is characterized by episodic chest pain at rest with transient ST-segment elevation, not progressive heart failure. * **Stable Angina:** This involves predictable chest pain triggered by exertion due to a fixed atherosclerotic plaque [2]. While it indicates ischemia, the primary manifestation is exertional pain, not the structural remodeling seen in heart failure. **High-Yield Clinical Pearls for NEET-PG:** * **Morphology:** CIHD hearts are typically enlarged and heavy (cardiomegaly) with ventricular hypertrophy and dilation. * **Histology:** Look for diffuse subendocardial vacuolization (myocytolysis), interstitial fibrosis, and scars of healed previous infarcts. * **Diagnosis of Exclusion:** Ischemic cardiomyopathy is often diagnosed when a patient presents with heart failure and significant coronary artery disease is found, after ruling out other causes like valvular or primary dilated cardiomyopathy.

Q: A 30-year-old male patient presented with dyspnea. Echocardiography showed mitral stenosis with left atrial hypertrophy. The excised mitral valve is shown in the image. What is the most likely diagnosis given the findings?

Rheumatic heart disease. ***Rheumatic heart disease*** - **Mitral stenosis** with **left atrial hypertrophy** in a young adult is pathognomonic of rheumatic heart disease, especially in endemic areas like India. - The excised valve shows characteristic **fish mouth deformity**, **commissural fusion**, **leaflet thickening**, and **subvalvular apparatus changes** typical of chronic rheumatic valvulitis. *Tuberculosis* - Tuberculosis rarely causes **isolated mitral stenosis** and typically presents with **pericardial involvement** or **constrictive pericarditis**. - **Granulomatous inflammation** with **caseous necrosis** would be evident histologically, which is not characteristic of mitral stenosis pathology. *Sarcoidosis* - Cardiac sarcoidosis primarily affects the **conduction system** and **ventricular myocardium**, rarely causing valvular stenosis. - Presents with **non-caseating granulomas** and typically involves **multiple organ systems** with **bilateral hilar lymphadenopathy**. *Fungal granuloma* - Fungal endocarditis typically causes **vegetative lesions** and **valve destruction** rather than the organized **fibrotic stenosis** seen in rheumatic disease. - Usually occurs in **immunocompromised patients** or those with **prosthetic valves**, and presents acutely rather than as chronic stenosis.

Q: What is the most common benign tumor of the heart in children?

Rhabdomyoma. **Explanation:** **Rhabdomyoma** is the most common primary cardiac tumor in infants and children, accounting for over 50% of cases. These are considered hamartomas rather than true neoplasms. They typically present as multiple, firm, grey-white nodules within the ventricular myocardium. A key clinical feature is their tendency for **spontaneous regression** over time, meaning surgical intervention is rarely required unless they cause significant outflow tract obstruction or refractory arrhythmias. **Analysis of Incorrect Options:** * **Myxoma:** This is the most common primary cardiac tumor in **adults**. In children, it is rare and usually associated with "Carney Complex" (spotty skin pigmentation, endocrine overactivity, and myxomas). * **Fibroma:** The second most common cardiac tumor in children. Unlike rhabdomyomas, fibromas are usually solitary, located in the interventricular septum, and **do not regress** spontaneously. They are associated with Gorlin syndrome. * **Lipoma:** These are slow-growing tumors composed of mature adipose tissue. While they can occur in the heart, they are significantly less common than rhabdomyomas in the pediatric age group. **High-Yield Clinical Pearls for NEET-PG:** * **Association:** Approximately 50–80% of children with cardiac rhabdomyoma have **Tuberous Sclerosis Complex (TSC)**. Conversely, rhabdomyoma is often the first clinical sign of TSC detected on fetal ultrasound. * **Histology:** Look for characteristic **"Spider Cells"** (large cells with central cytoplasm and radial granular extensions to the cell membrane). * **Location:** Most commonly found in the ventricles (intramural).

Question 1

Which of the following is/are the characteristics of the vegetations seen in patients with Libman-Sacks endocarditis?

Accepted Answer

All the above

Answer

Medium sized

Answer

Irregular contour

Answer

Present on the surface of cusps of heart valves

Question 2

Vegetations on the under-surface of Aortic valve leaflets are typically found in which condition?

Accepted Answer

Libman-Sacks endocarditis

Answer

Acute Rheumatic carditis

Answer

Non-bacterial thrombotic endocarditis

Answer

Chronic rheumatic carditis

Question 3

Which of the following forms of ischemic heart disease manifests with slowly progressive heart failure, with or without other clinical manifestations of myocardial ischemia?

Accepted Answer

Chronic ischemic heart disease

Answer

Myocardial infarction

Answer

Prinzmetal angina

Answer

Stable angina

Question 4

Senile cardiac amyloidosis is due to deposition of amyloid which is similar to which of the following proteins?

Accepted Answer

Transthyretin

Answer

Beta-2 microglobulin

Answer

Atrial natriuretic peptide (ANP)

Answer

Pyrin

Question 5

A 15-year-old boy died suddenly while playing in the field. On autopsy, fibrofatty replacement of the right ventricular myocardium is seen. What is the most likely diagnosis?

Accepted Answer

Arrhythmogenic right ventricular dysplasia

Answer

Dilated cardiomyopathy

Answer

Hypertrophic cardiomyopathy

Answer

Obstructive cardiomyopathy

Question 6

Which is the most sensitive and specific marker for myocardial infarction?

Accepted Answer

Troponin

Answer

CK-MB

Answer

Myoglobin

Answer

LDH

Question 7

A 25-year-old basketball player suddenly collapsed during an athletic event and died. Autopsy revealed a hypertrophied septum. What is the most probable diagnosis?

Accepted Answer

Hypertrophic Obstructive Cardiomyopathy (HOCM)

Answer

Right ventricular conduction abnormality

Answer

Epilepsy

Answer

Snake bite

Question 8

A 30-year-old male patient presented with dyspnea. Echocardiography showed mitral stenosis with left atrial hypertrophy. The excised mitral valve is shown in the image. What is the most likely diagnosis given the findings?

Accepted Answer

Rheumatic heart disease

Answer

Tuberculosis

Answer

Sarcoidosis

Answer

Fungal granuloma

Question 9

A patient with chest pain was diagnosed with myocardial infarction and received immediate thrombolytic therapy. Despite this, their cardiac condition worsened, leading to death. The patient was posthumously diagnosed with cardiac reperfusion injury. Which of the following histological findings is expected in the cardiac tissue following reperfusion injury?

Accepted Answer

Presence of contraction bands

Answer

Presence of coagulative necrosis with neutrophilic infiltration

Answer

Deposition of granulation tissue

Answer

Fibrosis and scar formation

Question 10

What is the most common benign tumor of the heart in children?

Accepted Answer

Rhabdomyoma

Answer

Myxoma

Answer

Fibroma

Answer

Lipoma

Cardiac Pathology — MCQs

Cardiac Pathology — MCQs

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