42-year-old male 3 months postoperative resection of a left cerebellar pontine angle epidermoid. Redemonstrated is a nonenhancing cystic lesion in the left cerebellopontine angle cistern that measures up to 29 mm in maximal transaxial dimension (as measured on diffusion imaging), unchanged. As before, the lesion is isointense to CSF on T1 and T2 technique, demonstrating some elevated signal on FLAIR. Its overall size and morphology are unchanged. There is associated posterior deviation of the left 7th and 8th cranial nerve complex as well as mass effect upon the brainstem, pons, left middle cerebellar peduncle, and left cerebellar hemisphere. As before, there is a small developmental venous anomaly in the right inferior frontal gyrus. There is scattered mild mucosal thickening in the paranasal sinuses. There is a small amount of fluid signal in the right mastoid air cells. The major cerebral flow voids are intact. Left posterior calvarial changes are consistent with the previously demonstrated biopsy injury site. There has been interval resolution of postprocedural pneumocephalus.
Stable left cerebellopontine angle epidermoid. Resolution of previously demonstrated postprocedural pneumocephalus.