Histological classification of (pre)cancerous lesions of the cervix
According to the classification, there are 3 grades of dysplasia before
the stage of actual cancer:
CIN1 or mild dysplasia: abnormal cells are found in no more than 1/3 of the epithelium CIN2 or moderate dysplasia: abnormal cells are found in no more than 2/3 of the epithelium CIN3 or severe dysplasia: abnormal cells can be found up to the full thickness of the epithelium Invasive carcinoma: invades the dermis after having breached the basal membrane
Cancers of the cervix can belong to two histological types: epidermoid cancer (95%) and adenocarcinoma or glandular cancer (5%).