title: Diffusion differences between pilocytic astrocytomas and grade II ependymomas.
abstract: BACKGROUND
  The aim of our study was to differentiate between cerebellar pilocytic astrocytomas and grade II ependymomas on the basis of their diffusion properties.
  
  
  METHODS
  The study prospectively included 12 patients with pilocytic astrocytomas and 5 with ependymomas. Apparent diffusion coefficients (ADC) were compared between tumour types.
  
  
  RESULTS
  ADC values were significantly higher in pilocytic astrocytomas than ependymomas, with almost no overlapping of the range of measured ADCs between the two tumour types.
  
  
  CONCLUSIONS
  Significant diffusion differences between pilocytic astrocytomas and grade II ependymomas enable their preoperative distinction, in combination with conventional magnetic resonance images.
authors.affiliation: Department of Radiology, University Hospital Center Zagreb, University of Zagreb School of Medicine, Zagreb, Croatia.
authors.forename: Goran
authors.initials: G
authors.lastname: Pavlisa
authors.forename: Gordana
authors.initials: G
authors.lastname: Pavlisa
authors.forename: Marko
authors.initials: M
authors.lastname: Rados