anus anatomy. treatment of diseases of rectum hemorrhoids

abscess anal anatomical anatomy anus bacteria bandage cancer closeup coagulator coat colitis colon colonoscopy colorectal concept conservative cross diagnosis digestion disease diseases doctor exam external fissure fistula genitourinary health healthcare hemorrhoidectomy hemorrhoids incontinence inflammation ligator man medical medicine microbes model obstacle pain pathology physiology polyp proctologist rectal rectum scheme stages treatment