A vascular tumor preponderantly composed of large dilated blood vessels, often containing large amounts of blood, occurring in the skin, subcutaneously, or both, and also in many viscera, particularly the liver, spleen, pancreas, and sometimes the brain. The typical superficial lesions are bright to dark red in color; deep lesions have a blue color. A cavernous hemangioma in the skin extends more deeply than a capillary hemangioma and is less likely to regress spontaneously. (Dorland, 27th ed; from Stedman, 25th ed).