-Case Reports-

A Case of Adenosquamous Carcinoma of the Ascending Colon

Kimiyoshi Yokoi^1,2, Noritake Tanaka^1,2, Kiyonori Furukawa^1,2, Tomoko Seya^1,2, Yoshiharu Ohaki³ and Takashi Tajiri¹

¹Surgery for Organ Function and Biological Regulation, Graduate School of Medicine, Nippon Medical School
²Department of Surgery, Nippon Medical School Chiba Hokusoh Hospital
³Department of Pathology, Nippon Medical School Chiba Hokusoh Hospital

Adenocarcinoma accounts for most of the malignant tumors originating from the colon, whereas adenosquamous carcinoma is rare, accounting for about 0.1% of all colon cancers. We present herein a case of adenosquamous carcinoma of the ascending colon. The patient was a 94-year-old woman who presented with a chief complaint of lower abdominal pain. A barium enema examination and lower gastrointestinal endoscopy showed a type 3 tumor in the ascending colon, and a biopsy confirmed the diagnosis of adenosquamous carcinoma. Right hemicolectomy was performed, and the tumor was diagnosed as a stage III advanced colon cancer. The patient had postoperative aspiration pneumonia and died 35 days after surgery. A search of Japanese literature over the past 25 years yielded 70 patients with adenosquamous carcinoma of the colon, and the clinicopathological features are discussed herein.

J Nippon Med Sch 2008; 75: 242-246

Keywords
adenosquamous carcinoma, colon

Correspondence to
Kimiyoshi Yokoi, Department of Surgery, Nippon Medical School Chiba Hokusoh Hospital, 1715 Kamagari, Inba-mura, Inba-gun, Chiba 270-1694, Japan
kimiyoko@nms.ac.jp

Received, March 14, 2008
Accepted, May 7, 2008