http://www.guideline.gov/summary/summary.aspx?ss=15&doc_id=3286&nbr=&string=

The site presents information about the guideline which uses the 2001 Bethesda System for cytological classification that uses the terms low-grade intraepithelial lesion (LSIL) and high-grade intraepithelial lesion (HSIL) to refer to cervical cancer precursors. The guideline developers adopted a two-tiered terminology for the histopathological classification of cervical intraepithelial neoplasia (CIN): CIN 1 denotes low-grade precursors and CIN 2,3 denotes high-grade precursors.