Fig. 8. Distal rectal cancer with extension to levator ani and anal canal. Large mass with central ulcer is noted in distal rectum on this coronal image.

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Fig. 8. Distal rectal cancer with extension to levator ani and anal canal. Large mass with central ulcer is noted in distal rectum on this coronal image. Mass involves both internal and external (white arrowhead) sphincters. Unlike patient's right side, where thin perirectal fatty tissue (open arrows) between far distal rectum and right levator and intersphincteric plane (white arrow) remain intact, tumor has replaced perirectal fat and has extended to levator (open arrowhead) on patient's left side. Fig. 8. Distal rectal cancer with extension to levator ani and anal canal. Large mass with central ulcer is noted in distal rectum on this coronal image. Mass involves both internal and external (white arrowhead) sphincters. Unlike patient's right side, where thin perirectal fatty tissue (open arrows) between far distal rectum and right levator and intersphincteric plane (white arrow) remain . . . Korean J Radiol. 2017 Jan-Feb;18(1):132-151. https://doi.org/10.3348/kjr.2017.18.1.132