<prompt> A patient treated for infeility with clomiphene citrate presents with sudden onset of abdominal pain and distension with ascites. Most probable diagnosis is:Uterine ruptureEctopic pregnancy ruptureMultifetal pregnancyHyperstimulation syndrome  <response>: Ovarian hyperstimulation syndrome OHSS is a clinical symptom complex associated with ovarian enlargement resulting from exogenous gonadotropin therapy. Symptoms may include abdominal pain and distension, ascites, gastrointestinal problems, respiratory compromise, oliguria, hemoconcentration, and thromboembolism. Predisposing factors for OHSS include, Multifollicular ovaries such as with PCOS Young age High estradiol levels during ovulation induction Pregnancy Ref: Hoffman B.L., Schorge J.O., Schaffer J.I., Halvorson L.M., Bradshaw K.D.,Cunningham F.G., Calver L.E. 2012. Chapter 20. Treatment of the Infeile Couple. In B.L. Hoffman, J.O. Schorge, J.I. Schaffer, L.M. Halvorson, K.D. Bradshaw, F.G. Cunningham, L.E. Calver Eds, Williams Gynecology, 2e. 