Intrauterine device is the commonest method of reversible contraception worldwide. It's trans vesical migration or misplacement is a very rare complication with a high ratio of calculi formation. We present a case of a 39-year old patient with a large vesical stone prolapse in vagina lumen measuring 15.36 cm × 8.87 cm weighing 450 grams on a intra uterine copper contraceptive dispositive complicated with a large vesical fi stula. The a lithotomy was performed via the low approach. The management of the fi stula was done 3 months later.Giant bladder stone on an intra uterine contraceptive device is a very rare clinical entity. monitoring of intrauterine contraceptive devices is necessary.
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