Porencephalic cyst


Features are more suggestive of an intra-axial cyst, mostly porencephalic cyst. Features that suggest intra-axial location are:

  • normal appearance of Sylvian fissure and nearby extra-axial space with no extrinsic mass effect upon the brain surface
  • surrounding white matter and lateral ventricle wall around the inner surface of the lesion
  • the outer wall, delineated by superficial cortical veins, looks continuous with brain surface
  • it is not lined by a grey matter and is associated with a small amount of adjacent FLAIR hyperintensity