73 years Male (DOB:5/21/1943)Reason: hx left side meningioma/Schwannoma. Preop planning for surgery History: left side hearing loss, ataxiaPROVIDER/ATTENDING NAME: BAKHTIAR YAMINI BAKHTIAR YAMINI There is a 27 x 34 mm enhancing mass located at the left cerebellopontine angle cistern associated with extension to the left internal auditory canal. This associated with compression of the adjacent brainstem and some T2 signal hyperintensity within the left cerebral peduncle, left midbrain, pons and left the middle cerebellar peduncle. Normal vascular flow voids are present in the distal carotid and vertebral arteries, the basilar artery and the proximal anterior, middle and posterior cerebral arteries as well as the internal cerebral veins and superior sagittal sinus.There is mild ventriculomegaly present which has progressed since the prior exam. On the current exam biventricular diameter is approximately 42 mm whereas on the prior it was 35 mm.The visualized portions of the paranasal sinuses are clear. The visualized portions of the mastoid air cells are clear. The visualized portions of the orbits are intact.
1.There is a left cerebellopontine angle cistern mass present which is associated compression of the adjacent brainstem and cerebellum where there is also edema. This compatible with schwannoma.2.There is ventriculomegaly which has mildly progressed compared to the prior exam..3.This examination was performed the purpose of stereotactic guidance during surgery.