Intrauterine retained fetal bones as a cause of secondary infertility

SummaryThree cases of retained fetal bones, the first two after mid-trimester termination of pregnancy and the third after dilatation and evacuation (D&E) of the uterus for a missed abortion, are presented. All the cases were complicated by secondary infertility. In all the cases the diagnosis was confirmed by a high resolution pelvic ultrasound scan. The pieces of bones were removed at dilatation and evacuation under general anaesthesia. In two of the cases pregnancy occurred within 6 months of removal of the bones. It is believed that bones retained freely in the endometrial cavity behave as an intrauterine contraceptive device (IUCD). Because of the many complications associated with mid-trimester dilatation and evacuation of the uterus, its role in modern gynaecology should be limited. It is suggested that retained fetal bones should be considered in the differential diagnosis of women presenting to infertility clinics when there is a history of mid-trimester D&E of the uterus.