Metastasis to heart are mostly from –
**Core Concept**
Metastasis to the heart is a rare but serious complication of cancer, often resulting from the spread of malignant cells from other primary sites. The heart's unique anatomy and physiology make it a challenging organ for tumor cells to invade and establish metastasis.
**Why the Correct Answer is Right**
The most common primary sites for metastasis to the heart are the lungs, breast, and melanoma. This is due to the high blood flow and pressure within the pulmonary and systemic circulation, which facilitates the seeding and implantation of tumor cells on the heart's endothelial surface. The heart's rich lymphatic drainage also plays a role in the metastatic process. Specifically, melanoma is notable for its high propensity to metastasize to the heart, often in the form of cardiac sarcomas or melanoma nodules.
**Why Each Wrong Option is Incorrect**
**Option A:** While liver metastases are common in various cancers, they are not typically associated with direct metastasis to the heart.
**Option B:** Kidney metastases are also common, but they are not the primary source of cardiac metastases.
**Option C:** Prostate cancer is not typically known for metastasizing to the heart.
**Clinical Pearl / High-Yield Fact**
The heart's unique susceptibility to metastasis is often related to its high surface area and turbulent blood flow, making it a challenging organ for tumor cells to invade and establish metastasis.
**Correct Answer: C. Melanoma.**