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Anal fissure

Summary of Anal fissure
An anal fissure or rectal fissure is a break or tear in the skin of the anal canal. Anal fissures may be noticed by bright red anal bleeding on toilet paper, sometimes in the toilet. If acute they may cause pain after defecation but with chronic fissures pain intensity is often less. Anal fissures usually extend from the anal opening and are usually located posteriorly in the midline, probably because of the relatively unsupported nature and poor perfusion of the anal wall in that location. 

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Pathology

Gastrointestinal system

Peritoneum and peritoneal cavity disorders
Upper gastrointestinal tract disorders
Lower gastrointestinal tract disorders
Liver, gallbladder and pancreas disorders
Gastrointestinal system pathology review