Anus, Rectum, and Prostate

• terminal portion of the rectum
• lined by columns of mucosal tissue (columns of Morgagni)

inflammatory tract that runs from the anus or rectum and opens onto the surface of the perianal skin or other tissue

infection with the HPV

• tear in the anal mucosa
• appears most often in the posterior midline

benign growth of the prostate gland common in men older than 50 years of age

• adult nematode (parasite) lives in the rectum or colon and emerges onto the perianal skin to lay eggs while the person sleeps 
• common in children

varicose veins in the rectum that may be external below the anorectal line and/or internal above the anorectal line

• congenital defect in which the rectal opening is blocked or missing
• one of a variety of anorectal malformations that can occur during fetal development

infection of the soft tissues surrounding the anal canal

cyst or sinus tract located in the midline superficial to the coccyx and lower sacrum

• projecting mass of swollen membrane that may occur anywhere in the intestinal tract
• may be malignant or benign

gland located at the base of the bladder and surrounding the urethra

inflammation of the prostate gland

• itching of the skin around the anus
• commonly caused by fungal infection in adults and by parasites in children

condition in which the rectal mucosa (with or without the muscular wall) protrudes through the anal ring

terminal portion of the GI tract