[Intrauterine device migrating to the bladder].

Transuterine migration of an intrauterine contraceptive device (IUCD) is a rare complication. The authors report a case of IUCD which migrated into the bladder and subsequently became calcified. This 34-year-old woman had been fitted with an IUCD for 4 years. She presented an unwanted pregnancy and signs of disabling cystitis at the end of pregnancy. The diagnosis of migration of the IUCD into the bladder with secondary calcification was suggested on the plain abdominal x-ray and on ultrasound and was confirmed by cystoscopy. Ballistic lithotripsy of the bladder stone with endoscopic extraction of the IUCD was then performed.