Fissure-in-ano (fish’er) is a condition characterized by a longitudinal crack or slit (ulcer) in the skin of anus. If the skin lining of the lower end of the anus gets scratched, it may break up into a fissure. Fissure-in-ano is observed in children as well as in adults; however, it is more common amongst middle-aged adults.
The posterior midline of the anus is the most common location for fissure due to low supply of blood in this area. Rarely, it can be present on the other areas, such as sides of the anus rather than posterior midline position. Such fissure may be the manifestation of underlying disease e.g. Crohn's disease, ulcerative colitis etc.
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