Hypobaric sacral anesthesia for anorectal surgery.
D001003:Anal Canal / Q000601:surgery*; D000758:Anesthesia; D000775:Anesthesia, Spinal; D013505:Digestive System Surgical Procedures; D006801:Humans; D012007:Rectum / Q000601:surgery*; D012447:Sacrum
ANESTHESIA, SPINAL; ANUS/surgery; RECTUM/surgery