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Purpose: Ultralow anterior resection and coloanal anastomosis (hand-sewn) has commonly been used for preserving the anal sphincter in patients with low-lying distal rectal cancer. Preoperative chemoradiation therapy is a contributing factor to preserve the anal sphincter. Intersphincteric resection has been introduced and has begun to be applied to distal rectal cancer for anal sphincter preservation. The aim of this study was to report on patients who underwent intersphincteric resection and coloanal anastomosis for very low-lying rectal cancer. Methods: Intersphincteric resection was performed in 21 patients with very low-lying rectal cancer (within 4 cm from the anal verge) between December 2004 and May 2008. All patients received colonic J pouch anal anastomosis and loop ileostomy. The patients were selected prospectively and followed up for the function of bowel movement and recurrence. Results: Mean tumor distance from anal verge was 2.8 cm (range 2∼4 cm). No postoperative mortality was encountered. One patient developed ischemic colitis of colonic J-pouch after high doses of tomotherapy. Subsequently he received abdominoperineal resection and permanent colostomy. One patient underwent diverting colostomy for severe incontinence after ileostomy takedown. The other cases reported good anorectal function such as frequency of bowel movement and fecal incontinence. There were two local recurrences during a mean follow-up period of 11.6 months. Conclusion: Based on a single surgeon’s experiences, postoperative morbidity and anorectal function after intersphincteric resection with coloanal anastomosis seems acceptable.

Intersphincteric Resection and Coloanal Anstomosis for Very Low Lying Rectal Cancer