Question: are low grade cells precancerous?
Answer: SIL used to be called cervical intraepithelial neoplasia (CIN) and was graded according to how deep the abnormal cells were within the surface of the cervix. LSIL, previously graded as CIN 1, usually disappear without treatment. HSIL, previously graded as CIN 2 or CIN 3, are precancerous.