Cervical perforation by the strings of a levonorgestrel releasing-intrauterine system: a case report.

A very rare case of perforation of the uterine cervix by the strings of a levonorgestrel releasing-intrauterine system (LNG-IUS) in a 47-year-old woman is presented. The method to retrieve the strings back into the cervical canal, leaving the LNG-IUS in situ, is described. We suggest that the threads of an intrauterine contraceptive occasionally may penetrate tissue like setons do, when used for treatment of fistulae.