[Superselective angiography of lower gastrointestinal bleeding; a report of three case].

Angiography was performed in three patients with lower gastrointestinal bleeding. Extravasation was demonstrated only with superselective catheterization of a branch of superior mesenteric artery. However, this bleeding was not demonstrable with conventional catheterization of superior mesenteric artery. Superselective catheterization is suggested as a useful technique to detect lower gastrointestinal bleeding.