Abstract
A 63-year-old man was incidentally found on abdominal ultrasonography to have an intra-abdominal tumor. Computed tomography (CT) showed a tumor in the ascending colon at the hepatic flexure, which was diagnosed as intussusception by colonoscopy. Since he had no symptoms, elective surgery was planned, and laparoscopic right hemi-colectomy was performed. On histopathological examination, a map-like alveolar lesion and proliferation with marked lymphocyte infiltration was observed, and medullary carcinoma of the colon was diagnosed. The patient's postoperative course was good without any complications, and he was discharged on the 8th postoperative day.
Medullary carcinoma of the colon is a relatively new concept described for the first time in the 8th Japanese Classification of Colon Cancer. It is most commonly found in the right-sided colon and has a relatively good prognosis. The tumor diameter is relatively large, and it has often already infiltrated into the subserosal layer at the time of diagnosis. A case of medullary carcinoma of the ascending colon with intussusception is presented along with relevant literature based on the clinical features of colonic intussusception.
