Ovarian hyperstimulation syndrome
 Discussion of Ovarian hyperstimulation syndrome
- Ovarian hyperstimulation syndrome is usually iatrogenic secondary to ovarian stimulant drug therapy for infertility but may occur as a spontaneous event in pregnancy.
- The syndrome consists of ovarian enlargement with extravascular accumulation of exudates leading to weight gain, ascites, pleural effusions, intravascular volume depletion with hemoconcentration, and oliguria in varying degrees.
- Pain, abdominal distention, nausea, and vomiting are frequently seen.
 Imaging Findings for Ovarian hyperstimulation syndrome
- The imaging findings are similar at US, CT, and MR imaging.
- Ovarian enlargement by distended corpora lutea cysts of varying sizes.
- Because the enlarged follicles are often peripheral in location, a "wheel spoke" appearance has been described, with stromal ovarian tissue located centrally with surrounding cysts.
- Familiarity with ovarian hyperstimulation syndrome and the appropriate clinical setting should help avoid the incorrect diagnosis of an ovarian cystic neoplasm.
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 References for Ovarian hyperstimulation syndrome
- Genevieve L. Bennett, Chrystia M. Slywotzky, and Giovanna Giovanniello. Gynecologic Causes of Acute Pelvic Pain: Spectrum of CT Findings. RadioGraphics 2002 22: 785-801.