Presentation
History of recent head trauma and found incidental finding on CT.
Patient Data
Right frontal cortical and subcortical hypodense lesion with associated focal thinning of the frontal bone suggesting long standing lesion.
A right frontal subcortical multicystic area that displays CSF signal intensity in all pulse sequences with no significant mass effect, diffusion restriction or post-contrast enhancement.
Case Discussion
Dilated perivascular spaces are usually incidentally discovered. In most cases they are small and cyst-like yet in few cases they enlarge, acquire bizarre shape and mistaken for tumors. Sometimes they may cause mass effect. Here is a nice example of giant type II perivascular spaces.
The differential diagnosis includes: