Cervical intraepithelial neoplasia

Also known as CIN, abnormalities in the cells of the cervix which may become cancerous. The CIN grading system is used to distinguish levels of change in the surface cells of the cervix in biopsy samples taken during colposcopy, a procedure usually performed following an abnormal cervical smear test. Grades CIN 1–3 broadly correspond to mild to severe cervical dysplasia in cells obtained from a smear.