High grade anal<unk> .<unk>  <unk>  is the development of a benign<unk>  or high-grade dysplasia in an epithelium. The exact dividing<unk> e between dysplasia and<unk>  has been very difficult to draw throughout the era of medical science. It varies between persons. In the localizations shown below, the term<unk>  is used to describe more accurately what was historically referred to as epithelial dysplasia.<unk>  is not cancer, but it is associated with higher risk for developing cancer in future. It is thus sometimes a precancerous condition.
Intraepithelial neoplasia
Epithelial dysplasia
Squamous intraepithelial lesion
Hyperplastic polyp
In situ lymphoid neoplasia
Inflammatory fibroid polyp
Carcinoma in situ
Cryptitis