<unk>  is a surgical procedure that involves treating mucosal fissures from the<unk>  canal/sphincter. The word is formed from sphincter + otomy (to cut, to separate).
Anal sphincterotomy
Lateral internal sphincterotomy
Rectal dilator
Ureterosigmoidostomy
Coloanal anastomosis
Michelassi strictureplasty
Finney strictureplasty
Stapled hemorrhoidopexy