In Japan, perforations/penetrations by fish bones are frequently reported; however, colorectal perforation/penetration by chicken bones is rare. An 88-year-old female with a history of 3 surgeries for rectal cancer, liver metastasis, and renal cancer presented with a 10-day history of abdominal pain and diarrhea after consuming chicken fries. Computed tomography showed a linear high-density structure penetrating the sigmoid colon. We performed an emergent endoscopic extraction and diagnosed her with colonic penetration caused by an accidentally ingested chicken bone. Colonoscopy revealed a chicken bone with the ends piercing the wall of the sigmoid colon. The chicken bone was removed with grasping forceps. Her subsequent course was favorable, and she was discharged on hospital day 11.
