Fig. 1
Preoperative examinations. (a) A submucosal tumor extending from the liver flexure to the ascending colon was detected by colonoscopy. (b) Computed tomography showed irregular tumor edges and highly dense areas indicative of calcification. (c) The primary tumor standardized uptake value (SUVmax) of F-18 deoxyglucose was measured at 2.4–3.4 by positron emission tomography