Anal Intraepithelial Neoplasia (AIN): Understanding Your Pathology Report
Anal intraepithelial neoplasia (AIN) is a precancerous change in the cells lining the anus and anal canal. It is caused by infection with human papillomavirus (HPV). The abnormal cells stay within the surface lining and have not grown into the tissue below, so AIN is not cancer. Some cases, mainly high-grade cases, can turn into …
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