To evaluate the significance of atypical squamous cells of undetermined significance(ASCUS) by following-up cervical cytologic smears or histologic finding.

Two hundred fifty three cases were diagnosed as ASCUS on cervical cytologic smears from January, 3, 1997 to september, 16, 1998 at cytopathology laboratory, College of Medicine, Keimyung Univemity. These cases were evaluated by cervical smears or subsequent biopsies.

The results were as follows, On repeat cervical smears, inflammation was 19.7%, normal was 11,1% and HSIL was 1.6%. On histologic diagnosis, CIS was 13,4%, cervicitis was 12,6%, invasive cervical cancer was 4.0%, and severe dysplasia was 3.2%.

A diagnosis of ASCUS on smears need careful follow-up.