[Cytological diagnosis of precancerous conditions and carcinoma of the uterine cervix].

Study comprised 89,796 cytological smears and 113 cervical biopsies from patients cytologically screened during 4 years. Total of suspect and positive findings was 766 (0.86 per cent). Cytological diagnosis of precanceroses was correct in all cases. The screening identified 9 of 17 invasive carcinomas. Eight patients with invasive carcinoma showed a previous cytological negativity (47 per cent). False negative cytology in materials from different sources (different regional sampling gynaecologists) correlated with percentage of unrepresentative smears.