Angiographic evaluation and management of acute gastrointestinal hemorrhage

Figure 5 Contrast extravasation demonstrating location of lower gastrointestinal bleeding. A: Superior mesenteric artery arteriogram shows an amorphous contrast collection (black arrow) arising from the left branch (long black arrow) of the middle colic artery; B: Later in the arterial phase the collection has increased and is layering dependently in the colon, assuming the configuration of the haustra. This extravasated contrast medium denotes the site of lower gastrointestinal bleeding.