The intrauterine device (IUD) is a contraception method widely used in developing countries because of its effectiveness and low cost. Its insertion is a simple medical procedure, but may present some complications, such as intravesical migration complicated with a lithiasis, which is rare but not negligible. We report here a case of IUD having migrated into the bladder, which has calcified secondarily. The patient is a 48-year-old woman who had consulted for irritative bladder signs for 2 months. The history revealed that the third pregnancy was contracted on the IUD, fitted 18 years ago and left uncontrolled after delivery.The gynecological examination did not objectify the marker tail of IUD. The pelvic ultrasound and the abdomen X-ray without preparation revealed the uterine vacuity and the IUD surrounded by stones on the bladder area. A supplementary scan confirmed it without showing a vesico-uterine fistula. The cystoscopy allowed to remove the IUD after having fragmented the lithiasis by endo-vesical pneumatic lithotripsy with Lithoclast.Imaging methods are critical to make a diagnosis. The admittance in urology is required and the preferred treatment is based on cystoscopy extraction. In order to avoid such complication, it is therefore important to follow the medical instructions for the placement of IUD and to regularly verify its localization.