Giant cystic Virchow-Robin spaces with adjacent white matter signal alteration.

Perivascular spaces surround the small arteries and veins as they enter into the brain parenchyma from the subarachnoid spaces. Also called as Virchow-Robin spaces, these are prominent in the basal ganglia and high convexity white matter of the elderly. Occasionally VR spaces may get massively enlarged and may mimic a cystic mass lesion. The typical CSF-like signal intensity of the cysts and location on MRI, in the absence of a neurological abnormality help in the diagnosis of the giant VR spaces and thus biopsy is avoided. Typically there is no significant adjacent brain abnormality; however FLAIR images may sometimes reveal perilesional white matter hyperintensity, which may be an indication of gliosis due to the mass effect of the lesion. Such a signal alteration should not deter one from making a diagnosis of giant Virchow-Robin spaces when the rest of the imaging findings are typical. We describe a case of a 50-year-old female with incidental giant Virchow-Robin spaces in the right hemispheric subcortical white matter with adjacent white matter hyperintense signal intensity on T2-weighted and FLAIR images.