Enlarged Virchow-Robin (perivascular) space
Incidental finding on CT brain
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Dilated perivascular space displays CSF signal
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 tumour or choroidal fissure cyst (in the choroidal fissure). This is best sorted out on the coronal projection.