Abstract
Intrauterine devices (IUDs) are reliable method for contraception. Although, they are generally regarded as safe, serious consequences may occur in case of uterine perforation or intravesical migration. We present a rare case of a 74 year old lady with a forgotten IUD for 42 years resulting in intravesical migration, formation of vesicovaginal fistula (VVF) without uterine perforation, complete urinary incontinence, recurrent urinary tract infections (UTIs) and a large vesicovaginal calculus.