A case of adenosquamous carcinoma of the cecum was reported.
A 71-year-old man complaining of constipation and admitted to our hospital for further investigation, because cecal tumor was pointed out by his home doctor. Barium enema examination revealed elevated lesion with central small ulcer. Abdominal computed tomography showed the wall thickness of cecum. Endoscopic examination revealed reddish flat elevated lesion with central small ulcer. Histological findings of biopsy specimen showed moderately differntiated adenocarcinoma. Operation was performed under the diagnosis of cecal cancer. The resected specimen demonstrated a type 2 tumor measurering 2.2×2.5cm in size. Histological findings of resected specimen showed adenosquamous carcinoma with no lymphnode metastasis. It was advanced carcinoma infiltrating into the excessserosal layer.
Adenosquamous carcinoma of the cecum is considered to be a relatively rare disease and only 19 cases have been reported in Japan. In etiology of adenosquamous carcinoma, the theory of squamous cell metaplasis of colonic adenocarcinoma has been widely supported.
