A case of gossypiboma diagnosed with transanal double-balloon enteroscopy.

Gossypiboma is an iatrogenic granuloma caused by retained surgical gauze. A 48-year-old woman with a history of cesarean section was incidentally found to have a pelvic mass on preoperative computed tomography examination for pectus excavatum. Abdominal enhanced computed tomography showed a 40-mm mass containing air in the pelvis. The mass was suspected to be continuous with the ileum. Transanal double-balloon enteroscopy showed a small fistula that was likely caused by penetration of the ileum dozens of centimeters from the ileocecal valve. A yellow-brown, movable, and fibrous body was found in the fistula. A part of the fibrous body was extracted with forceps. Pathological examination revealed that it was gauze. This is the first reported case of an asymptomatic gossypiboma penetrating the ileum that was diagnosed with double-balloon enteroscopy. Our results suggest that double-balloon enteroscopy is useful for early diagnosis of pelvic mass penetrating intestine, including gossypiboma.