Planning for SRS treatment of a meningioma. There is a dural-based mass that involves the left cavernous sinus and petroclival regions, measuring up to approximately 20 mm in thickness. There is mild mass effect upon the medial left temporal lobe, without evidence of vasogenic edema. There is encasement of the cavernous left internal carotid artery, without significant narrowing of the flow void. The ventricles and basal cisterns are unchanged in size and configuration. There is no midline shift or herniation. The orbits, skull, paranasal sinuses, and scalp soft tissues are grossly unremarkable.
Preoperative planning MRI for a left cavernous sinus and petroclival region meningioma.