Benign Peptic Ulcer as a Cause of Gastrocolic Fistula.

Gastrocolic fistula is a rare complication and can occur in various conditions, most commonly gastric or colonic adenocarcinoma, followed by benign gastric ulcers secondary to nonsteroidal anti-inflammatory drug use. We report a case of an 82-year-old man with a benign peptic ulcer that led to a gastrocolic fistula, which was not associated with a history of nonsteroidal anti-inflammatory drug use or malignancy. The exact cause of this patient's gastrocolic fistula is unclear, but the patient's medical history of microscopic lymphocytic colitis may have increased his risk of fistula formation.