title: Clinical and neurophysiological observations after superior petrosal vein obstruction during surgery of the cerebellopontine angle: case report.
abstract: OBJECTIVE
  Preservation of venous drainage during surgery of the cerebellopontine angle has received little attention.
  
  
  METHODS
  We describe changes in brainstem auditory evoked potentials after temporary obstruction of the superior petrosal vein during surgical resection of a small meningioma at the petrous apex via a standard suboccipital-lateral approach. Temporary clipping of the petrosal vein resulted in deterioration of the brainstem auditory evoked potentials. The tumor was removed with preservation of the superior petrosal vein.
  
  
  CONCLUSIONS
  A transient postoperative cochlear nerve deficit emphasizes the importance of venous drainage and its preservation during surgery for small lesions of the cerebellopontine angle that do not distort normal anatomic structures.
authors.affiliation: Department of Neurosurgery, University of Erlangen-Nürnberg, Germany. christian.strauss@neurochir.med.uni-erlangen.de
authors.forename: C
authors.initials: C
authors.lastname: Strauss
authors.forename: M
authors.initials: M
authors.lastname: Neu
authors.forename: B
authors.initials: B
authors.lastname: Bischoff
authors.forename: J
authors.initials: J
authors.lastname: Romstöck
mesh_terms: D002530:Cerebellopontine Angle / Q000601:surgery*; D003056:Cochlear Nerve / Q000503:physiopathology*; D003250:Constriction; D016057:Evoked Potentials, Auditory, Brain Stem; D005260:Female; D006801:Humans; D008577:Meningeal Neoplasms / Q000601:surgery*; D008579:Meningioma / Q000601:surgery*; D008875:Middle Aged; D010579:Petrous Bone / Q000098:blood supply*; D011183:Postoperative Complications; D013997:Time Factors; D014680:Veins / Q000503:physiopathology