Ovarian Torsion

Etiology: twisting of ovary causing decreased arterial flow (but ovary has dual blood supply from ovarian + uterine arteries)
US: enlarged ovary with multiple peripheral cysts
Clinical: large ovarian cysts / masses are predisposing factor for torsion

Cases of Ovarian Torsion

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.

US and CT of ovarian dysgerminoma with torsion — Transverse and sagittal US of the pelvis (above) shows an echogenic and inhomgenous solid mass superior to the bladder. Neither ovary could be visualized. Axial CT with contrast of the abdomen shows a solid non-enhancing midline mass.