[A Case of Scarred Tissue Caused by a Hem-o-Lok Clip Used during Descending Colon Cancer Resection].

A 70-year-old male patient underwent robot-assisted laparoscopic partial resection of the descending colon as additional treatment after endoscopic resection for descending colon cancer. There was no residual cancer in the resected specimen, and the pathological examination results indicated pTisN0M0, pStage 0. Abdominal CT performed 1 year postoperatively showed a 14 mm nodular lesion around the inferior mesenteric artery. Positron emission tomography(PET-CT)revealed increased fluorodeoxyglucose(FDG)uptake, with a maximum standardized uptake value(SUVmax)of 2.6. Based on the location of the nodule, we considered it to be a granuloma arising around the Hem-o-Lok clip used on the root of the left colonic artery. However, the possibility of lymph node recurrence could not be completely ruled out; therefore, we decided to perform surgery for diagnosis and treatment. Intraoperative findings revealed that the nodule was located around a clip on the left colonic artery. Pathological findings revealed fibrous connective tissue with no malignancy. Even prior to surgery, we suspected a foreign body granuloma, but it was difficult to rule out malignant disease. Granulomas can also accumulate on PET-CT, making it difficult to differentiate them from malignant tumors. Diagnostic treatment is considered necessary if malignancy cannot be ruled out.