我們報告一位四十二歲女性病患，十四年前生完第三胎後接受了宮內避孕器（銅7）。兩個月後再懷孕並自然生產而子宮內避孕器發生異物潛行。病人產後再接受一子宮內避孕器（銅T）。此後十三年無症狀，直到一年半前發生下腹痛及血尿。異物膀胱結石經診斷後，施行內視鏡檢及電擊碎石術取出結石及子宮內避孕器。子宮內避孕器潛行並非少見，然而潛行到膀胱造成結石是非常少見的。據吾人所知，自一九七二年至一九九三年間，有文獻報告的只有二十例。

Migration of IUD (intrauterine device) is not uncommon. However, intravesical migration of IUD with stone formation is very rare. To our knowledge, only 20 cases had been reported in the literature since 1972 to 1993. Herein, we report a 42-year-old woman in whom an IUD (Copper-7) migrated into the bladder 2 months after insertion and she got pregnancy in 1980. The child was delivered by nature. The woman remained asymptomatic for 13 years until she presented with urinary symptoms. The foreign body induced vesical calculus was removed by cystoscopy and EHL (Electrohydraulic lithotripsy).