What is the term for a tumor of a blood vessel?

The term for a tumor of a blood vessel is angioma. Angiomas are formed from the abnormal growth of blood vessels, which can lead to benign tumors. They can appear in various forms, such as hemangiomas, which specifically involve blood vessels, and lymphangiomas, which involve lymphatic vessels. Angiomas may present as red or purple marks on the skin or other tissues, indicating their vascular nature.

Chondroma refers to a tumor composed mainly of cartilage and is not related to blood vessels. Fibroma is a tumor that arises from fibrous connective tissue and similarly does not involve blood vessels. Myoma, on the other hand, describes a tumor of muscular tissue, frequently seen in the uterus as uterine fibroids. Therefore, among the options provided, angioma is the most accurate term for a tumor specifically associated with blood vessels.