Because venous thrombus within the twisted vascular pedicle is a specific pathological finding for adnexal torsion, to reveal the thrombus by MRI may be diagnostic. Surgically proven five benign ovarian masses with torsion were retrospectively evaluated. High intensity venous thrombus within the twisted vascular pedicle on fat-saturated T1WI were detected in four lesions (80%) but not in one acute torsion, whereas signal voids on susceptibility-weighted MR sequences (SWS) were detected in all five lesions (100%). SWS also revealed hemorrhagic infarction of all five ovarian masses with torsion, whereas fat-saturated T1WI could demonstrate high intensity hemorrhagic infarction in four lesions.
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