5Insausti J N, Urresola O A, Atilano S L,et al. Uterovesical perforation secondary to intrauterine device with vesical lithiasis formatlon: a report of two cases[J]. Radiologia, 2007,49 (2): 129-132.
6Mulayim B, Mulayim S, Celik NY. A lost intrauterine device Guess where we found it and how it happened[J]. Eur J Contra cept Reprod Health Care, 2006,11 (1) : 47-49.
7Tuncay YA,Tuneay E,Guzin k. Transuterine migration as a complication of intrauterine contraceptive devices:six case reports[J]. Eur J ContraeeptReport Health Care,2004,9 : 194-200.
8Chi E, Rosenfeld D, Sokol TP. Laparoscopic removal of an intrauterine device perforating the sigmoid colon: a case report and review of the literature[J]. Am Surg,2005,71(12):1055-1057.
