A rare case of ulcerative colitis following Bacillus Calmette-Guérin therapy.

A 60-years-old male was referred to us due to frequent discharge of blood and mucus during the last 2 months. The patient had a history of bladder cancer and was under therapy with intra-vesical Bacillus Calmette Guerin (BCG) for the last 4 months. Colonoscopy revealed loss of vascular pattern, erythematous appearance, granularity, and friability in the mucosa of the distal rectum.