title: Sporadic unilateral vestibular schwannoma with islets of meningioma: case report.
abstract: OBJECTIVE
  Vestibular schwannomas with meningioma islets have been rarely reported in the literature; they have been observed only among patients with neurofibromatosis Type II. We present a case of a sporadic mixed tumor in a patient without neurofibromatosis Type II that was not suspected before surgery.
  
  
  METHODS
  A 59-year-old female patient presented with clinical signs of progressive loss of hearing. Her family history did not include evidence of neurological diseases. Magnetic resonance imaging scans revealed a typical unilateral vestibular schwannoma.
  
  
  METHODS
  The tumor presented with invasion of the surrounding arachnoid membrane, as well as Cranial Nerves VII and VIII. Preservation of the facial nerve with complete removal of the tumor was not possible. Therefore, Cranial Nerve VII reconstruction was performed.
  
  
  CONCLUSIONS
  The concomitant occurrence of schwannomas and meningiomas infiltrating the arachnoid membrane might be related to poor clinical outcomes for patients with neurofibromatosis Type II, with respect to preservation of facial and acoustic nerves. Among sporadic schwannomas, this phenomenon is extremely rare.
authors.affiliation: Department of Neurosurgery, Hannover Medical School, Germany. Luedemann.Wolf@MH-Hannover.de
authors.forename: W
authors.initials: W
authors.lastname: Lüdemann
authors.forename: A C
authors.initials: AC
authors.lastname: Stan
authors.forename: M
authors.initials: M
authors.lastname: Tatagiba
authors.forename: M
authors.initials: M
authors.lastname: Samii
mesh_terms: D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008577:Meningeal Neoplasms / Q000175:diagnosis / Q000473:pathology* / Q000601:surgery; D008579:Meningioma / Q000175:diagnosis / Q000473:pathology* / Q000601:surgery; D008875:Middle Aged; D009361:Neoplasm Invasiveness / Q000473:pathology; D018193:Neoplasms, Complex and Mixed / Q000473:pathology* / Q000601:surgery; D009464:Neuroma, Acoustic / Q000175:diagnosis / Q000473:pathology* / Q000601:surgery