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hemangioma (he-man″je-o´mә)   a common type of congenital vascular malformation or benign tumor made up of newly formed blood vessels clustered together; it may be present at birth or appear a little later. The most common type appears as a network of small blood-filled capillaries near the surface of the skin, forming a red to purple birthmark. Other types are sometimes found in the liver and in bones.




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