The means for diagnosis, treatment and long follow-up of intra epithelial carcinomas of the uterine cervix are assessed by the authors, about 124 cases seen at the Hotel-Dieu de Paris. The diagnosis is given by cytologic means and mostly by colposcopic examination. When the cylindro-pavimental junction (usual initial focus) is seen in totality, direct biopsies always gave an accurate diagnosis. When the junction is not seen, only a diagnostic--conisation can allow a definitive answer. Two types of surgical treatment were applied: amputation of the cervix conservative of menstrual and/or reproductive functions and, hysterectomy led by vaginal or abdominal route. The patients were followed from 1 to 16 years by the triple cytologic, Schiller test and colposcopic examination: none of them showed any recurrence either of intra-epithelial or of invasive type.