angioma (an-je-o'mah)

A tumor composed of abnormally arranged, tortuous and dilated blood or lymph ve els, or of ve els showing true proliferation of cells. The varieties are: a. simplex. Known also as telangiectasis, but incorrectly, because there is present something more than a dilatation of ve els in an actual new formation of ve els, cavernous a. Similar in structure to the corpus caver no sum of the penis, being made up of the retiform blood spaces, cirsoid a. A variety of a. characterized by thickened, dilated, tortuous, pulsating ve els; arteries forming the tumor rather than capillaries and many of the capillaries having aneurismal dilatation. cutaneous a., subcutaneous a. This form of a. develops most frequently in the skin and subcutaneous ti ue, especially in the cheeks, eyelids, lips, and scalp. They are red in color and the blood may be driven out on pre ure, returning when the pre ure is removed. [Gr., aggeion, a ve el, -+- oma, tumor.]