title: A 48-year-old man with acute, 'knife-like' rectal pain.
authors.affiliation: Department of General Internal Medicine, Cleveland Clinic Foundation, OH 44195, USA. rosed@ccf.org
authors.forename: David Z
authors.initials: DZ
authors.lastname: Rose
authors.forename: Navin
authors.initials: N
authors.lastname: Kedia
authors.forename: Jesse T
authors.initials: JT
authors.lastname: Jacob
authors.forename: J Walton
authors.initials: JW
authors.lastname: Tomford
mesh_terms: D017088:AIDS-Related Opportunistic Infections; D003937:Diagnosis, Differential; D005401:Fissure in Ano / Q000382:microbiology / Q000821:virology*; D015658:HIV Infections / Q000150:complications / Q000175:diagnosis*; D006801:Humans; D015212:Inflammatory Bowel Diseases / Q000175:diagnosis; D008297:Male; D008875:Middle Aged; D012002:Rectal Diseases / Q000382:microbiology / Q000821:virology; D012871:Skin Diseases / Q000821:virology*