NCIt definition : A precancerous neoplastic process that affects the cervical squamous epithelium without
evidence of invasion. It is usually associated with human papillomavirus infection.
It is characterized by the presence of mild atypia in the superficial epithelial layer
that may be associated with koilocytosis. Maturation is present in the upper two thirds
of the epithelium. Mitotic figures are not numerous and are present in the basal third
of the epithelium.;