what is hemangioma
From Wikipedia, the free encyclopedia. A hemangioma is a benign and usually self-involuting tumor (swelling or growth) of the endothelial cells that line blood vessels that is characterised by increased number of normal or abnormal vessels filled with blood.It usually appears in the first weeks of life and grows most rapidly over the first six months.n more severe cases hemangiomas may leave residual tissue damage. In infancy, it is the most common tumor. The word hemangioma comes from the Greek haema- (Î±Î¯Î¼Î±), blood; angeio (Î±Î³Î³ÎµÎ¯Î¿), vessel; -oma (-ÏÎ¼Î±), tumor.