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An ovarian torsion in severe spontaneous ovarian hyperstimulation syndrome associated with a singleton pregnancy

Ovarian hyperstimulation syndrome (OHSS) is a life-threatening condition, usually associated with pharmacological ovarian stimulation. Spontaneous OHSS is a rare condition, usually appearing in multiple gestation, hypothyroidism or polycystic ovarian syndrome (Baksu et al. 2004). Pharmacologically-induced or spontaneous, OHSS is characterized by ovarian enlargement along with a fluid shift into extravascular spaces causing ascites, pleural and/or pericardial effusion, hypovolemia and oliguria. A clear pathogenesis of this condition is still not understood. We report a case of spontaneous OHSS in a singleton pregnancy complicated with ovarian torsion. Another similar case has been reported recently (Baksu et al. 2004).