Abstract
A rare case of adenosquamous carcinoma of the ascending colon is reported. A 64-year-old woman on hemodialysis for chronic renal failure was admitted to the hospital because of sudden onset of abdominal pain. Emergency laparotomy was performed with a suspicion of perforative peritonitis. Approximately 2.5 liter of serous ascites was present in the peritoneal space and a hard mass was palpable in the ascending colon. A diagnosis of colonic neoplasm causing ileus was made and a right hemicolectomy with regional dissection of lymph nodes was carried out. The histopathology of the tumor demonstrated adenosquamous carcinoma. It was advanced carcinoma infiltrating into the subserosal layer, but there was no lymph node metastasis. Previous reports, together with our case, demonstrated that adenosquamous carcinoma preferred to occur in the proximal colon and was more aggressive than common carcinomas. Therefore, adenosquamous carcinoma of the colon may require a strict follow-up.
