Dilated Virchow-Robin spaces rarely cause mass effect and result in obstructive hydrocephalus.

The dilated bit how-to in spaces follow CSF signal on all MR sequences without signal changes in the surrounding brain parenchyma nor solid enhancing components which allow certain diagnosis.  

The differential diagnosis for giant VR spaces are cystic neoplasms which rarely follow CSF signal and cystic periventricular leukomalacia.