Massive ovarian edema is a rare tumor-like condition occurring in young women; it involves enlargement of theovary, caused by intermittent torsion of the mesovarium. Ultrasonographically, a well-defined inhomogeneous softtissue mass lesion is seen, and this cannot be distinguished from other solid ovarian tumors. The MRI findings,seen on T1WI, are inhomogeneous high signal intensity of the central part, with peripheral low signal intensity ofthe mass lesion. On T2WI, the inner part of the mass shows high signal intensity and the peripheral part, lowsignal intensity. Ovarian follicles are arranged peripherally, and are seen as low signal intensity on T1WI, andhigh signal intensity on T2WI. These MR findings are specific for the diagnosis of massive ovarian edema.