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Benign Anorectal: Anal Fissure

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Abstract

An anal fissure, or fissure-in-ano, is an oval, ulcer-like, longitudinal tear in the anal canal, distal to the dentate line. Although the exact incidence is unknown, it is a common disorder, with equal gender distribution. Fissures can occur at any age, but are usually seen in younger and middle-aged adults. In almost 90% of cases, fissures are identified in the posterior midline, but can be seen in the anterior midline in up to 25% of affected women and 8% of affected men. An additional 3% of patients have both anterior and posterior fissures. Fissures occurring in lateral positions should raise suspicions for other disease processes, such as Crohn’s disease, tuberculosis, syphilis, human immunodeficiency virus (HIV)/ acquired immunodeficiency syndrome (AIDS), or anal carcinoma (Figure 12-1).

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Dykes, S.L., Madoff, R.D. (2007). Benign Anorectal: Anal Fissure. In: Wolff, B.G., et al. The ASCRS Textbook of Colon and Rectal Surgery. Springer, New York, NY. https://doi.org/10.1007/978-0-387-36374-5_12

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