To investigate the value of intersphincteric resection by transanal specimen eversion and extraction with ultra-low anal preservation in surgical treatment of rectal malignant tumors.

From May to December 2022, the clinical data of 3 cases with rectal malignant tumors treated in the Department of Colorectal Surgery of Sichuan Cancer Hospital who underwent intersphincteric resection (ISR) by transanal specimen eversion and extraction were retrospectively analyzed. The technical aspects of transanal resection were summarized and the value of the technique was discussed.

All three patients were successfully operated, with an average operation time of 337 minutes and an average blood loss of 40 ml; Among them, the average time for transanal resection was 5 minutes and the blood loss was 5 ml after the rectum was reversed and pulled out. All patients recovered smoothly after surgery and were discharged 10 days after operation. Following up to date, their anal sphincter functions has been acceptable.

The technique of intersphincteric resection by transanal specimen eversion and extraction facilitates the anus preservation, reduces the difficulty of transanal resection, shortens the operation time, and is conducive to clinical promotion. It could serve as a new alternative to anus preservation for surgical treatment of lower rectal malignant tumors.