Anal intraepithelial neoplasia (AIN)

What is anal intraepithelial neoplasia? Anal intraepithelial neoplasia (AIN) is a precancerous growth made up of abnormal squamous cells in the anus or anal canal. If left untreated, AIN can turn into a type of anal cancer called squamous cell carcinoma over time. Another name for AIN is squamous intraepithelial lesion (SIL). Where does anal …
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