Table 1.

The Bethesda system.

Cell types	Classification
Normal
Atypical squamous cells (ASC)	(1) atypical squamous cells of uncertain significance (ASC-US) (2) Highly squamous intraepithelial disease (ASC-H) cannot be ruled out; (3) Low-grade squamous intraepithelial lesions (LSILs, equivalent to CIN1); (4) Highly squamous intraepithelial lesions (HSILs), including CIN2 CIN3 and carcinoma in situ (CIS); (5) Squamous cell carcinoma (SCC)
Atypical glandular cells (AGC)	(1) Atypical glandular cells, not otherwise specified (AGC-NOS); (specify endocervical, endometrial, or not otherwise specified) (2) Atypical glandular cells, favor neoplastic; (specify endocervical or endometrial) (3) Endocervical adenocarcinoma in situ (AIS); (4) adenocarcinoma (specify endocervical, endometrial, extrauterine, or not otherwise specified).