Preoperative planning for meningioma. There is a left cavernous sinus and petroclival dural-based mass that measures up to at least 3 cm. There is associated marked mass effect upon th left pons. There is patchy high T2 signal in the adjacent brainstem as well. There are postoperative findings related to prior left temporal craniotomy with encephalomalacia in the left anterior temporal lobe. There is a right transfrontal ventricular catheter. The ventricles are unchanged in size and configuration.
Preoperative planning MRI shows a left cavernous sinus and petroclival meningioma with marked mass effect upon the left pons and associated vasogenic edema.