Choroidal fissure cyst
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There is a well-defined cystic lesion within the right choroidal fissure of homogeneous CSF signal on all sequences with no calcification seen.
MRI feature of a choroidal fissure cyst (incidental finding). There are signs confirming extra-axial location as splaying of the right posterior cerebral artery and indentation of the right mesial temporal lobe.
The main differential diagnosis is a solitary enlarged perivascular space (if intra-axial location).