Diffusion-weighted magnetic resonance imaging of intracranial epidermoid tumours

Australas Radiol. 1999 Feb;43(1):16-9. doi: 10.1046/j.1440-1673.1999.00619.x.


Intracranial epidermoids can closely mimic cerebrospinal fluid (CSF) on MRI and CT. Therefore epidermoids can be difficult to detect, or distinguish from CSF. Three cases of intracranial epidermoid are presented, one of which closely mimicked an arachnoid cyst on CT and routine MRI sequences. Diffusion-weighted magnetic resonance imaging (DWI) was performed. All three epidermoids demonstrated marked restriction of diffusion relative to CSF, clearly defining the extent of each lesion, and allowing differentiation from an arachnoid cyst or an enlarged CSF space.

Publication types

  • Case Reports

MeSH terms

  • Adult
  • Arachnoid Cysts / diagnosis
  • Brain Diseases / diagnosis*
  • Brain Diseases / surgery
  • Diagnosis, Differential
  • Epidermal Cyst / diagnosis*
  • Epidermal Cyst / surgery
  • Humans
  • Magnetic Resonance Imaging*
  • Male
  • Middle Aged