2 cases of perforation of the uterine wall by an IUD, in women 31- and 32-years-old, are presented. The 1st case involved the clear perforation of the uterine wall upon insertion. In the 2nd case the insertion of the device into the puerperal wall proceeded clinically asymptomatic and the point of perforation was not safely ascertained. The occurrence of uterine perforation with an IUD is uncommon, its frequency varying from 1:200 to 1:2000 depending on the type of device. It occurs most frequently with the Dana and Dana Super. The possibilities of migration of a deformed device into the uterine wall are considered, although examination of data shows that the extrauterine localization of the IUD invariably occurs during the insertion.