Tehran University of Medical Sciences Acta Medica Iranica 0044-6025 48 2 2010 04 15 125 126 EN Nadereh Behtash Department of Gynecology Oncology, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran, Iran. Setareh Akhavan Department of Gynecology Oncology, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran, Iran. Sara Mokhtar Department of Gynecology Oncology, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran, Iran. 2015 09 28 Intrauterine device (IUD), a conventional method of contraception is rarely associated with uterine perforation and extra uterine dislocation. A 29 years old woman complaining of vaginal bleeding was referred for pelvic mass identified in ultrasound. The mass was confirmed with CT scan. In laparatomy we found an IUD in cul-de-sac and pelvic mass was apparently an organized hematoma. Transmigrated IUD can induce organized hematomas presenting as a pelvic mass. https://acta.tums.ac.ir/index.php/acta/article/view/3663 https://acta.tums.ac.ir/index.php/acta/article/download/3663/3638