Variable MR findings in ovarian functional hemorrhagic cysts.

PURPOSE: To describe the magnetic resonance (MR) findings in ovarian functional hemorrhagic cysts (FHC). MATERIALS AND METHODS: A total of 21 patients with 22 FHC, proven by follow-up ultrasound (US) in 11 women and surgery in 10 women, had US and MR examinations within 24 hours. The study was limited to cysts with obvious an echogenic pattern. All patients had T2-weighted fast spin echo (FSE), T1-weighted spin echo (SE), and T1-weighted SE fat-suppressed sequences. RESULTS: Four cysts (18%) were hypointense on T1-weighted-images without and with fat suppression, and hyperintense on T2-weighted-images. Five cysts (23%) were hypointense on T1-weighted images without and with fat suppression but heterogenous on T2-weighted images. Five cysts (23%) were hypointense on T1-weighted images but showed intermediate signal intensity on T1-weighted fat suppression images and heterogenous signal intensity on T2-weighted images. Two cysts (9%) were entirely intermediate on T1-weighted images. Five cysts (23%) displayed high signal intensity occupying less than 30% of the cystic content on T1-weighted images and one cyst (5%) displayed high signal intensity occupying more than 30% of the cystic content. CONCLUSION: Despite an obvious echogenic pattern on US, 64% of FHC were hypointense on T1-weighted images and 18% were also hyperintense on T2-weighted images. Only 36% demonstrated intermediate or high signal intensity on T1-weighted images.

Extraovarian cystadenomas: ultrasound and MR findings in 7 cases.

OBJECTIVE: To describe the ultrasound and MR appearance of paraovarian cystadenomas. METHODS: We reviewed retrospectively the radiologic findings in 7 patients with surgically proven paraovarian cystic neoplasms, including 6 serous cystadenomas and 1 borderline seromucinous cystadenoma. All had ultrasound and 4 had MR preoperatively. RESULTS: On ultrasound, the ipsilateral ovary was visualized in six cases, in contact with the cyst in five and separate from it in one. On MR, the ovary and the cyst were visible in four cases, in contact in three and separate in one. Internal papillary excrescences, present at pathology in all cysts, were seen in five on ultrasound and in four on MR. CONCLUSION: Although the extraovarian location of these neoplasms is difficult to determine preoperatively by ultrasound and MR, these imaging modalities are more reliable in predicting the histology of these rare lesions and differentiating them from simple paraovarian cysts.