[Adnexial torsion caused by ovarian hyperstimulation syndrome]

A case of adnexal torsion of an enlarged ovary during early pregnancy after gonadotropin therapy is presented. Adnexal torsion is a rare but serious complication to ovarian hyperstimulation. The diagnosis is difficult, but the combination of ovarian enlargement, abdominal pain, nausea, progressive leukocytosis and anaemia may indicate torsion of the adnex. Prompt diagnosis is important. Simple unwinding of the twisted adnex by a laparoscopic technique has been successful in most cases.