NCIt definition : An intraepithelial lesion of the vulvar squamous epithelium associated with HPV infection.
It is characterized by loss of maturation, nuclear hyperchromasia, high nuclear:cytoplasmic
ratios, cytological and architectural atypia, and mitoses. Two morphological patterns
have been described: basaloid (undifferentiated) and warty (condylomatous, bowenoid).
It carries a significant but relatively low risk of progression to squamous cell carcinoma
if untreated. (WHO 2020);