Anal fissure or fissure in ano is a longitudinal tear or split in the skin covering the distal anal canal below the level of the dentate line, overlying the lower half of the internal sphincter (Fig. 4.1). It usually presents as a linear superficial ulcer in the anoderm and is characterized by excruciating sharp perianal pain associated with passage of small amounts of bright red blood per rectum and/or pruritus (Zaghiyan and Fleshner 2011).
KeywordsAnal Canal Anal Fissure Internal Anal Sphincter Internal Sphincter Chronic Anal Fissure
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