Arteriographic diagnosis of a juvenile colon polyp.

A juvenile colon polyp was demonstrated by inferior mesenteric arteriography in a 21-year old man with recurrent, massive, unexplained gastrointestinal bleeding. The arteriogram demonstrated a mucosal blush at the tip of the polyp along with a solitary prominent draining vein in the stalk and a nest of draining veins at the base of the stalk.