Intravesical migration of intrauterine device resulting in stone formation.

The intrauterine contraceptive device has been in use for many years, and migration of the device from the uterus to the pelvic cavity has been reported by many investigators. Although perforation of the uterus by an intrauterine contraceptive device is not uncommon, intravesical migration and secondary stone formation are rare complications. We report on a 27-year-old woman in whom an intrauterine contraceptive device (Copper-T) migrated from the uterus to the bladder and resulted in formation of a stone.