From a review of 1477 polyps of the cervical canal it appears that these very frequent lesions occur between the ages of 41 and 50 in relation to the disendocrine picture which characterises that age. The histological point of view reveals a picture in which the adenomatous variety predominates, followed by the mixed forms. The Authors, following colposcopic checking repeated in time on the same patients, are able to demonstrate that squamous metaplasia may originate in the subcylindrical reserve cells. There have not been cases of carcinomatous degeneration, inasmuch as their only case proved to be a metastasis of continuity from a carcinoma of the cervix, for which reason such neoplasias are not be considered precancerous lesions.