Which of the following is the most common tumours of hea?
**Core Concept**
The question is testing the student's knowledge on cardiac tumors, specifically the most common type. Cardiac tumors can be benign or malignant, and they arise from various types of heart tissue, including the myocardium, valves, and endocardium.
**Why the Correct Answer is Right**
The most common type of cardiac tumor is the atrial myxoma. Atrial myxomas are benign tumors that arise from the atrial septum, typically in the left atrium. They are composed of myxomatous tissue, which is rich in mucopolysaccharides and blood vessels. The exact pathogenesis of atrial myxomas is not well understood, but they are thought to arise from the transformation of mesenchymal cells in the atrial septum. Atrial myxomas can cause a variety of symptoms, including obstructive symptoms due to their size and location, and they can also lead to systemic embolization due to their fragile nature.
**Why Each Wrong Option is Incorrect**
* **Option A:** is incorrect because it is not a specific type of cardiac tumor.
* **Option B:** is incorrect because it is a rare type of cardiac tumor that is usually associated with a specific genetic syndrome.
* **Option D:** is incorrect because it is a malignant type of cardiac tumor that is much less common than benign tumors like atrial myxomas.
**Clinical Pearl / High-Yield Fact**
Atrial myxomas can be associated with a classic triad of symptoms: obstructive symptoms (e.g., dyspnea, chest pain), systemic embolization, and a "tumor plop" sound on physical examination.
**Correct Answer:** C. Atrial myxoma