Vols. Videos

Giant Perivascular Spaces

Last Updated: October 1, 2018

Figure 1: Large, oval structure within the right putamen that follows CSF signal intensity on T1 (top row left), T2 (top row right), FLAIR (middle row left) and DWI (middle row right). Notice that there are a few additional similar-appearing smaller cystic structures medially, also representing dilated perivascular spaces. There is no significant adjacent FLAIR signal abnormality (middle row left) or enhancement (bottom row) to suggest an alternative diagnosis.


  • Pia-lined interstitial fluid filled spaces
  • Do not communicate with subarachnoid space