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Coronal T2W MRI showing sphincter status. (A) Arrow shows intersphincteric space (ISS) spared by tumor (*). (B) Arrow shows ISS invasion. (C) Mucinous tumor (*) invades ISS andexternal sphincter (arrow). (D) Tumor (*) invades levator ani (arrow). Dashed lines show incision for extralevator abdomino-perineal resection
