**Cardiac Tumors in Childhood**

**Core Concept**
The primary concern with cardiac tumors in childhood is the potential for malignant transformation and disruption of normal cardiac function. Rhabdomyomas are the most common type of cardiac tumor in children, often associated with tuberous sclerosis complex (TSC).

**Why the Correct Answer is Right**
Rhabdomyomas are benign cardiac tumors that typically present in infancy or early childhood. They are composed of striated muscle cells and are most commonly found in the ventricles. Rhabdomyomas are often associated with TSC, a genetic disorder characterized by the development of hamartomas in multiple organ systems. The presence of multiple cardiac rhabdomyomas is a key diagnostic criterion for TSC.

**Why Each Wrong Option is Incorrect**
**Option A:** Myxomas are more common in adults and are the most common type of cardiac tumor overall, but they are less common in children.

**Option B:** Fibromas are a type of cardiac tumor, but they are less common than rhabdomyomas in children.

**Option C:** Angiosarcomas are malignant cardiac tumors, but they are rare in children and not the most common type of cardiac tumor in this age group.

**Clinical Pearl / High-Yield Fact**
Rhabdomyomas are often associated with tuberous sclerosis complex (TSC), and the presence of multiple cardiac rhabdomyomas is a key diagnostic criterion for this condition.

**Correct Answer:** D. Rhabdomyoma.