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Abscess near anus
Anal fistula is a chronic abnormal communication between the epithelialised surface of the anal canal and usually the perianal skin. They can form when anal abscesses do not heal properly. Anal fistulae originate from the anal glands , which are located between the internal and external anal sphincter and drain into the anal canal. The tract formed by this process is a fistula.
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Abscess and Fistula Expanded Information | ASCRS
NCBI Bookshelf. Perianal abscesses are the most common type of anorectal abscesses. These abscesses can cause significant discomfort for patients. They are located at the anal verge and if left untreated can extend into the ischioanal space or intersphincteric space since these areas are continuous with the perianal space. They can also cause systemic infection if left untreated. Ninety percent of all anorectal abscesses are caused by non-specific obstruction and subsequent infection of the glandular crypts of the rectum or anus.
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Abscess and Fistula Expanded Information
An anal fistula also called fistula-in-ano is a small tunnel that tracks from an opening inside the anal canal to an outside opening in the skin near the anus. An anal fistula often results from a previous or current anal abscess. However, a fistula can also occur without an abscess. Small glands just inside the anus are part of normal anatomy. If the glands in the anus become clogged, this may result in an infection.
Ischiorectal, inter- and intrasphincteric abscesses have been described. Anorectal abscesses are classified according to their anatomic location and the following are the most common types; Perianal abscess, Ischiorectal abscess, Intersphincteric abscess and Supralevator abscess. Ischiorectal abscess is formed when suppuration transverses the external anal sphincter into the ischiorectal space. Intersphincteric abscess results from suppuration contained between the internal and external anal sphincters. Supralevator abscess forms from cephalad extension of the intersphincteric abscess above the levator ani or from caudal extension of a suppurative abdominal process like appendicitis, diverticular or gynaecologic sepsis.