Fig. 4.

Vestibular schwannoma. A 49-year-old-female presented with left side decreased hearing. (A) T1-weighted axial MRI with gadolinium shows a cystic cerebellopontine tumor causing mass effect on the cerebellum and brainstem. The patient underwent a left retrosigmoid craniotomy and tumor resection. (B–D) Intraoperative microscopic images show the tumor before resection (arrow) (B), after drilling the internal auditory canal (C), and after complete resection (D). Notice that the vestibular (V) and facial (F) cranial nerves were preserved. E, postoperative axial MRI demonstrates gross total resection. Used with permission from Barrow Neurological Institute.