title: Spontaneous ovarian hyperstimulation syndrome in a normal singleton pregnancy.
abstract: OBJECTIVE
  It is known that most cases of ovarian hyperstimulation syndrome (OHSS) are associated with the therapies for ovulation induction. However, OHSS may rarely be associated with a spontaneous ovulatory cycle, usually in the case of multiple gestations, hypothyroidism or polycystic ovary syndrome.
  
  
  METHODS
  A case of OHSS in a woman who became pregnant naturally and who had no underlying disease is presented here. The patient was managed expectantly with no complications.
  
  
  CONCLUSIONS
  Although spontaneous ovarian hyperstimulation is a rare entity, it is important to differentiate it from other causes of ovarian enlargement. Occasionally, life-threatening situations may occur, but it is usually a self-limiting process.
authors.affiliation: Department of Obstetrics and Gynecology, Faculty of Medicine, Pamukkale University, Denizli, Turkey. ozeroztekin@gmail.com
authors.forename: Ozer
authors.initials: O
authors.lastname: Oztekin
authors.forename: Ferit
authors.initials: F
authors.lastname: Soylu
authors.forename: Orkan
authors.initials: O
authors.lastname: Tatli
mesh_terms: D000328:Adult; D001201:Ascites / Q000473:pathology / Q000601:surgery; D018394:CA-125 Antigen / Q000097:blood; D005260:Female; D006801:Humans; D016471:Ovarian Hyperstimulation Syndrome / Q000097:blood / Q000175:diagnosis* / Q000503:physiopathology; D019152:Paracentesis; D011247:Pregnancy; D011248:Pregnancy Complications / Q000097:blood / Q000175:diagnosis* / Q000503:physiopathology
chemical_list: D018394:CA-125 Antigen