Right vestibular schwannoma treated with SRS: surveillance. There is no significant change in size of the right vestibular schwannoma that is extends from fundus of the internal auditory canal to the cerebellopontine angle cistern, now measuring up to 21 AP x 24 RL x 19 SI mm, previously 21 AP x 24 RL x 18 SI. There is associated mass effect upon the right middle cerebellar peduncle and right cerebellar hemisphere, where there appears to be mild edema. There is persistent slightly diminished fluid signal within the right labyrinthine structures. There are unchanged mild scattered foci of cerebral white matter T2 hyperintensity, which likely represent chronic microangiopathy. There is no evidence of acute infarction. The orbits, skull, paranasal sinuses, and scalp soft tissues are grossly unremarkable.
No significant interval change in size of the right vestibular schwannoma.