2022 Volume 55 Issue 9 Pages 583-590
A 56-year-old woman underwent total colonoscopy (TCF) at another hospital in 2013. A 0-Isp polyp was found in the descending colon and resected by endoscopic mucosal resection (EMR). The polyp was diagnosed as adenoma histopathologically, but it was difficult to evaluate the resection margin because of split excision. Four months later, TCF revealed recurrence of adenoma at the scar from EMR. Although additional treatment was recommended, the patient stopped going to the hospital. In 2017, she underwent another TCF and a type 1 lesion was found in the recurrence region. She was referred to our hospital and underwent left hemicolectomy with D3 lymph node dissection. The tumor was diagnosed as adenosquamous carcinoma with an adenoma component (T1b (SM massive), N0, ly0, v0, fStage I). The patient did not receive postoperative adjuvant chemotherapy and survived without recurrence for 49 months. Adenosquamous carcinoma of the colon with an adenoma component is very rare. We report this case with a review of the literature.
