title: Deep Sylvian fissure chordoid meningioma: case report.
abstract: OBJECTIVE
  A case of chordoid meningioma originating in the right sylvian fissure is reported. Chordoid meningiomas are uncommon tumors. This is the first reported case of a chordoid meningioma without dural attachment arising in the sylvian fissure.
  
  
  METHODS
  The patient presented with a generalized seizure. A heterogeneously enhancing right frontotemporal mass was identified on magnetic resonance imaging of the brain.
  
  
  METHODS
  The patient underwent a failed stereotactic biopsy attempt elsewhere. The tumor was ultimately resected using standard microsurgical techniques.
  
  
  CONCLUSIONS
  Meningiomas originate from arachnoid cap cells and can arise at locations remote from the pachymeninges. Although rare, meningiomas should be included on the differential diagnosis of sylvian fissure lesions.
authors.affiliation: Department of Neurosurgery, Mayo Clinic, Rochester, Minnesota 55905, USA. mciver.jon@mayo.edu
authors.forename: Jon I
authors.initials: JI
authors.lastname: McIver
authors.forename: Bernd W
authors.initials: BW
authors.lastname: Scheithauer
authors.forename: John L D
authors.initials: JL
authors.lastname: Atkinson
mesh_terms: D000328:Adult; D016545:Choroid Plexus Neoplasms / Q000473:pathology / Q000601:surgery*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008577:Meningeal Neoplasms / Q000473:pathology / Q000601:surgery*; D008579:Meningioma; D009493:Neurosurgery / Q000379:methods