Dieulafoy's vascular malformation as a cause of large intestinal bleeding.

Abstract
Four cases of Dieulafoy's vascular malformation of the caecum are reported. Three were associated with massive large bowel haemorrhage, one of which was fatal. The remaining case had a calibre persistent submucosal artery within the caecum that was found incidentally in a resection specimen. This vascular malformation should be considered when dealing with specimens resected for massive lower gastrointestinal bleeding.