Diffusion-weighted MRI postoperative assessment of an epidermoid tumour in the cerebellopontine angle

Neuroradiology. 1999 Nov;41(11):829-31. doi: 10.1007/s002340050850.


Cerebellopontine angle epidermoid tumour generally has a typical appearance with conventional MRI sequences. The lesion is irregular in shape and gives slightly higher signal than cerebrospinal fluid on T1- and T2-weighted images, with a characteristic marbled inner pattern on T1-weighted images. Diffusion-weighted imaging (DWI) can be useful for the diagnosis of an atypical epidermoid tumour. Our case report illustrates the usefulness of DWI for postoperative assessment of residual foci of tumour. The specific appearance of an epidermoid tumour is illustrated, with emphasis on apparent diffusion coefficient (ADC) measurements.

Publication types

  • Case Reports

MeSH terms

  • Adult
  • Basilar Artery / pathology
  • Basilar Artery / surgery
  • Brain Stem / pathology
  • Brain Stem / surgery
  • Cerebellar Diseases / pathology
  • Cerebellar Diseases / surgery*
  • Cerebellopontine Angle / pathology
  • Cerebellopontine Angle / surgery*
  • Cerebrospinal Fluid
  • Diagnosis, Differential
  • Diffusion
  • Echo-Planar Imaging / methods
  • Epidermal Cyst / pathology
  • Epidermal Cyst / surgery*
  • Female
  • Humans
  • Image Enhancement / methods
  • Magnetic Resonance Imaging / methods*