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

Mayumi Takeuchi¹, Kenji Matsuzaki¹, Hiromu Nishitani¹

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.