ischiorectal abscess

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ischiorectal abscess (isk-i-oh-rek-t'l) n. an abscess in the space between the sheet of muscle that assists in control of the rectum and the pelvic bone. Symptoms are severe throbbing pain near the anus with swelling and fever; it may cause an anal fistula. Pus is drained from the abscess by surgical incision.