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[procto- + -itis]
Inflammation of the rectum and anus that may be caused by sexually transmitted diseases, e.g., infections with herpes simplex virus, Neisseria gonorrhoeae, Chlamydia trachomatis; radiation injury, e.g., after treatment of cancers of the pelvis; inflammatory bowel disease, e.g., ulcerative colitis; allergy; trauma; or ischemia.