Is A

T1-hypointense intracranial lesion

May Be Caused by

 Common

Arachnoid cyst

Cystic encephalomalacia

Mega cisterna magna

Porencephalic cyst

 Uncommon

Dandy-Walker malformation

Hydatid cyst

Meningocele

Pseudomeningocele

Seroma

Trapped fourth ventricle