Newborn with an ovarian cyst on prenatal US

MRI of ovarian torsion
T1 coronal (left) and T1 sagittal (right) and T2 axial (below) MRI images show a heterogeneous intraperitoneal mass that appears to have hemorrhagic and calcified components. In the operating room this mass was found to be torsed.

The diagnosis was in-utero right ovarian torsion, presumably secondary to the ovarian cyst.