Secondary Infertility due to Retained Fetal Bones Diagnosed via Saline Sonography

Prolonged intrauterine retention of any fetal bones can lead to secondary infertility. The exact incidence remains unclear. This case report describes a 36-year woman with secondary infertility of eight years. Workup revealed echogenic foci partially embedded in endometrium on saline sonography. After ultrasound guided dilation and curettage, fetal bones were retrieved. Unexplained infertility can often be explained if before applying this label, uterine factor is also taken into account. When common causes like tubal blockage, male factor, and ovulatory dysfunction have been excluded, infrequent causes like polyps, adhesions, and in rare instances foreign bodies also should be looked for.