Severe spontaneous ovarian hyperstimulation syndrome with MR findings

We describe a case of severe spontaneous ovarian hyperstimulation syndrome (OHSS) with MR findings. MR scans showed bilateral symmetric enlargement of ovaries with multiple cystic changes, giving the classic "wheel-spoke" app earance. There was no definite abnormally thickened or enhanced wall, but t here was internal hemorrhage in some chambers. To avoid unnecessary laparot omy, we emphasize the importance of careful diagnosis to differentiate spon taneous OHSS from ovarian cystic neoplasms.