Which term describes a benign tumor made up of blood vessels?

The term that describes a benign tumor made up of blood vessels is hemangioma. Hemangiomas are characterized by an abnormal proliferation of blood vessels and typically present as red or purple lesions on the skin or internally. They are considered benign because they do not invade surrounding tissues or metastasize like malignant tumors. Hemangiomas can vary in size and may appear at birth or develop during the first year of life.

In contrast, fibromas refer to benign tumors composed of fibrous or connective tissue, lipomas are composed of adipose (fat) tissue, and adenomas arise from glandular epithelial tissue. Each of these tumors has a distinct cellular composition and origin, highlighting the unique identity of hemangiomas as specifically related to the vascular system.