Presentation
Trauma.
Patient Data
Age: 50 years
Gender: Female
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Sagittal non-contrast

CT of the brain demonstrates well-circumscribed fluid density cystic lesion in the left basal ganglia. No solid component, no mass effect.
Otherwise the brain is unremarkable.
Case Discussion
Perivascular spaces are benign fluid-filled spaces around perforated vessels. Often they are small but can reach giant size (like in this case).
It is important not to confuse perivascular spaces with cystic tumors.