Arteriovenous malformations of the colon.

Arteriovenous malformations have become recognized as a major cause of massive bleeding of the colonic origin. Although an arteriographic unit capable of serial magnification is ideal for detecting arteriovenous malformations in the bowel, the diagnosis may still be made by a combined approach of conventional arteriography, colonoscopy and operative juddment. the final diagnosis rests on gross and histologic demostration of vascular malformations in the excised specimen.