小脑桥脑角听神经（第八对脑神经）肿块病变，为小脑桥脑角神经鞘瘤，病人可出现听力降低。这类良性肿瘤可切除。
The mass lesion here is arising in the acoustic (eighth cranial) nerve at the cerebellopontine angle. This is a schwannoma. Patients may present with hearing loss. These benign neoplasms can be removed.