The experiment of electro-conization with diathermic loop was effected on 185 patients. The indications are represented by: a) low grade lesions: 21 cases (11.3%) only when the squamo-columnar junction was into the endocervix; b) CIN 2: 44 cases (23.7%): c) CIN 3: 118 cases (63.7%); d) cyto-histologic discordance: 2 cases. After one year, the following results could be noted: 94.1% of the patients were cured, only 11 out of the 185 presented a recurrence (or persistence). It seemed interesting to us to study the factors which could influence the "in sano" (Free margin)/or not character of the resection. It appeared that the surface of the lesion did not seem to influence its histological result since we got: 83%, 96%, 94.5% and 92.3% of "in sano" conizations to be correlated with a lesion surface equal to 1/4, 2/4, 3/4, 4/4 of the cervical area. The second factor to be studied was the patients' age. So from 15 to 25 years (96%) of the resections were "in sano". There from 26 to 35 (92%), and from 36 to 45 (91.9%). Among post-menopausal women from 46 to 55 years old only 86.4% of electro-conizations were "in sano". Histologic alterations of the histologic specimen were noted in two cases (1%), the interpretation was easy and clear in the other cases. What about the complications? In 2 cases a moderate stenosis was to be noted; in 2 other cases: post-operative hemorragiae which were treated by a selective electro-coagulation.(ABSTRACT TRUNCATED AT 250 WORDS)