Anal Ulcers

《英文msh詞典》Anal Ulcers
[入口詞] Anal Ulcers
[主題詞] Fissure in Ano
[英文釋義] 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)