The Mirena intrauterine system (IUS) has been licensed as a contraceptive in the UK since May 1995. Recent National Statistics suggest the Mirena IUS is used by only 1% of women aged 1649 years who are currently using contraception.1 The Mirena IUS now also has a licence for the management of idiopathic menorrhagia2 and may therefore be used by women who do not require contraception. Uterine perforation is a serious, albeit rare, potential complication of intrauterine device or system use. Wo...