Pai and coauthors review the management of patients presenting with obscure gastrointestinal bleeding during the period from 2005 to 2011. Four patients had preoperative localization of the bleeding site with superselective mesenteric angiography, which was confirmed by the use of intraoperative methylene blue injection. This novel technique allowed them to identify the abnormal pathology.
A 67-year old man was evaluated for lower gastrointestinal tract bleeding. What is your diagnosis?