Fissure in Ano |
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| Anal Ulcers; Fissure, Anal; Ulcer, Anal; Ulcers, Anal | |
| A painful linear ulcer at the margin of the anus. It appears as a crack or slit in the mucous membrane of the anus and is very painful and difficult to heal. (Dorland, 27th ed & Stedman, 25th ed) | |