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Uptodate Reference Title
Chronic anal fissure
Chronic anal fissure
Photograph of a chronic anal fissure in the posterior midline (arrow), which is the most common site of fissure formation. The raised edges and fibrotic appearance at the base of this fissure distinguish it from an acute anal fissure, which appears like a fresh laceration.
Reproduced by permission from the American Society of Colon and Rectal Surgeons.
