title: Convexity dural cavernous malformation with intradural and extradural extension mimicking a meningioma: a case report.
abstract: BACKGROUND
  Dural-based cavernous malformations are rare and have been more commonly described in the middle fossa. Fewer than 20 cases outside of the middle fossa have been reported and they often mimic more commonly found lesions such as meningiomas or hemangiopericytomas.
  
  
  METHODS
  We describe the unusual case of a right frontal convexity dural cavernous malformation with intradural and extradural components as well as erosion through the calvarium. The patient underwent a right frontal craniotomy and en-bloc resection of the mass. Final pathologic interpretation confirmed a cavernous malformation that had eroded through the calvarium.
  
  
  CONCLUSIONS
  Dural-based cavernous malformations are a rare entity, but should be considered in the differential diagnosis of atypical appearing dural-based lesions and soft subgaleal masses. If atypical features are present, further radiographic investigations should be undertaken. To our knowledge, this is the only reported case of a dural-based cavernous malformation eroding through the calvarium and presenting initially as a soft scalp mass.
authors.affiliation: Department of Neurosurgery, Boston Institute of Neurosurgery, Tufts Medical Center, 750 Washington Street, Boston, MA 02111, USA. shwang@tufts-nemc.org
authors.forename: Steven W
authors.initials: SW
authors.lastname: Hwang
authors.forename: Rolf M
authors.initials: RM
authors.lastname: Pfannl
authors.forename: Julian K
authors.initials: JK
authors.lastname: Wu
mesh_terms: D003399:Craniotomy; D004388:Dura Mater / Q000473:pathology* / Q000601:surgery; D005624:Frontal Bone / Q000473:pathology* / Q000601:surgery; D005625:Frontal Lobe / Q000473:pathology* / Q000601:surgery; D006261:Headache / Q000209:etiology; D006392:Hemangioma, Cavernous / Q000473:pathology* / Q000503:physiopathology / Q000601:surgery; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008577:Meningeal Neoplasms / Q000473:pathology* / Q000503:physiopathology / Q000601:surgery; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local; D019635:Neurosurgical Procedures; D012086:Reoperation; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome; D014717:Vertigo / Q000209:etiology