Cavernous hemangioma: A type of hemangioma composed of blood-filled "lakes" and channels. It is typically raised and red or purplish.
A cavernous hemangioma may diminish in size following trauma, bleeding or ulceration but it rarely disappears on its own. Small cavernous hemangiomas situated on the surface of the body may be removed or treated by electrocoagulation. Surgery is usually needed if a cavernous hemangioma causes increased growth of an extremity.