RT Book, Section A1 Dooley-Hash, Suzanne A1 Herrman, Nicholas W.C. A2 Knoop, Kevin J. A2 Stack, Lawrence B. A2 Storrow, Alan B. A2 Thurman, R. Jason SR Print(0) ID 1181041464 T1 Anorectal Abscess T2 The Atlas of Emergency Medicine, 5e YR 2021 FD 2021 PB McGraw-Hill PP New York, NY SN 9781260134940 LK accessmedicine.mhmedical.com/content.aspx?aid=1181041464 RD 2024/03/28 AB Anorectal abscesses include perianal and perirectal abscesses, which are named according to the involved space: ischiorectal, intersphincteric, supralevator, and horseshoe. These are most commonly found in males aged 30 to 50 years old and occur due to occlusion of the mucus-producing anal crypt glands. Patients typically present with severe pain in the perianal area. Constitutional symptoms such as fever and malaise may also be present. Examination will often reveal an area of erythema and perianal fluctuance. Deeper perirectal abscesses may only exhibit tenderness and fluctuance with digital rectal examination. Predisposing conditions include Crohn’s disease, chronic steroid use, diabetes mellitus, malignancy, radiation fibrosis, and trauma.