An 80-year-old man was admitted to our hospital presenting with a positive fecal occult blood test. Colonoscopy revealed that there was a laterally spreading tumor at the ascending colon near the ileocecal valve. A biopsy specimen showed an adenocarcinoma, and the depth of the tumor was suspected to be deep submucosal invasion (T1). The swollen lymph nodes were not detected around the tumor by computed tomography (CT). He had undergone open total cystectomy for bladder cancer with creation of an ileal conduit at the age of 78 years. The operation record stated that the ileum 15 cm apart from the ileocecal valve was used for the ileal conduit. However, detailed information about the vessel division for the ileal conduit reconstruction was not recorded. Because the severe adhesion after open total cystectomy was expected, we selected an open approach.