[A Case of Sigmoid Colon Cancer Identified by Gastric Perforation].

We report a case of sigmoid colon cancer that was incidentally found using CT that was performed for upper abdominal pain. An 83-year-old man with a long history of lung tuberculosis and idiopathic pulmonary fibrosis presented with upper abdominal pain. CT findings revealed free gas around the stomach. He was diagnosed with upper gastrointestinal perforation and his condition improved after undergoing conservative treatment. Upper endoscopy revealed an irregular ulcer at the angular incisure of the stomach with thickened folds, but biopsy resulted in a Group 1 classification. CT findings also incidentally revealed sigmoid colonic wall thickness, and colonoscopy showed a type Ⅰ lesion in the sigmoid colon, which biopsy resulted in Group 5, and we performed sigmoidectomy for sigmoid colon cancer under a combination of spine-subarachnoid and epidural anesthesia because of his respiratory dysfunction.