title: [Hypodense meningioma. A care report].
abstract: BACKGROUND
  Meningiomas are benign tumours which originate in the arachnoid layer and are characterized by being iso- or hyper-dense on computerized axial tomography (CAT). Hypodense meningiomas are relatively infrequent and normally behave thus because of their fat content. A hypomeningioma is almost entirely composed of adipose tissue. However, a meningiotheliomatous meningioma with fatty degeneration, which is the case being considered, is characterized by zones of meningiotheliomatous cells together with zones of adipocytes.
  
  
  METHODS
  We present the case of a 73 year old woman with a meningiotheliomatous meningioma with extensive fatty degeneration which on CAT scan showed as a hypodense lesion, with well-defined edges, which took up contrast heterogeneously and produced a hyperosfosant reaction. On magnetic resonance (RMN) it gave signals of heterogeneous intensities. Up to the present time, only four cases of pure lipomeningiomas have been described in the literature.
  
  
  CONCLUSIONS
  However, meningiomas with fatty degeneration are much more frequent. In this paper we discuss aspects of the differential diagnosis of meningiomas which behave as hypodense lesions on CAT scans.
authors.affiliation: Servicio de Neurocirugía, Complejo Hospitalario Universitario de Santiago, Santiago de Compostela, España.
authors.forename: A
authors.initials: A
authors.lastname: García-Pravos
authors.forename: M
authors.initials: M
authors.lastname: Gelabert
authors.forename: M D
authors.initials: MD
authors.lastname: Arias
authors.forename: J
authors.initials: J
authors.lastname: González
authors.forename: R M
authors.initials: RM
authors.lastname: Rumbo
mesh_terms: D000368:Aged; D001932:Brain Neoplasms / Q000175:diagnosis* / Q000601:surgery; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008579:Meningioma / Q000175:diagnosis* / Q000601:surgery; D014057:Tomography, X-Ray Computed
vernacular_title: Meningioma hipodenso. A propósito de un caso.