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Abstract #4143

MR Manifestations of Hyperreactio Luteinalis: Value of Diffusion-Weighted Imaging in the Differentiation from Neoplastic Lesions

Mayumi Takeuchi1, Kenji Matsuzaki1, Hiromu Nishitani1

1Department of Radiology, University of Tokushima, Tokushima, Japan

We evaluated MR findings of 11 ovaries with hyperreactio luteinalis (HL) in 6 women (3 pregnant; 2 hydatid mole; 1 iatrogenic). Enlarged ovaries appeared as multilocular cystic masses with septations mimicking mucinous cystic tumors. Ovarian stroma was detected as small solid portion exhibiting intermediate intensity on T2WI, intense contrast-enhancement on Gd-T1WI, and high intensity on DWI like solid tumoral portion of neoplasms. The ADC in ovarian stroma in HL was 1.86 +/- 0.37, which was significantly higher than that in ovarian cancers (1.10 +/- 0.28, n=39) and may be a clue to the differential diagnosis.