[Internal sphincterotomy in the surgery of hemorrhoids].
D001003:Anal Canal / Q000601:surgery*; D013505:Digestive System Surgical Procedures; D006484:Hemorrhoids / Q000601:surgery*; D006801:Humans; D019637:Orthopedic Procedures; D014656:Vascular Surgical Procedures
ANUS/surgery; HEMORRHOIDS/surgery