AbstractUse of levonorgestrel as emergency contraception is a safe and effective measure to prevent unwanted pregnancy. Limited data have been available on the effect of the pregnancy outcomes and there have been no reports on adverse birth outcomes, but only a small number of normal deliveries after levonorgestrel emergency contraception (LNG– EC) failure have actually been documented. We present a case of pregnancy following failure of levonorgestrel emergency contraception. The pregnancy was terminated as the fetus was affected by a lethal condition, sirenomelia or mermaid syndrome. Although LNG–EC taken during the conception cycle has no significant effects on the incidence of malformation, however the number of investigated pregnancies is relatively small, and these findings need to be further assessed in the context of larger groups including those are that are chosen to be aborted.
Keyword: Levonorgestrel; Emergency contraception failure; Sirenomelia; LNG- C.