Enlarged Virchow-Robin (perivascular) space

Discussion:

Typical enlarged VR space - location inferior to the basal ganglia adjacent ot the terminal ICA with fluid having identical characteristics to CSF (it is a CSF-filled space).  In this case we can actually see the vessel (penetrating barnch of the terminal ICA) passing through the space.  It should not be confused with a cystic tumor or choroidal fissure cyst (in the choroidal fissure).  This is best sorted out on the coronal projection.

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