Spot the abnormality.
Focal grey matter heterotopia seen adjoining the left frontal horn.
Selected images demonstrate an ovoid well defined focal lesion is seen abutting the frontal horn of left lateral ventricle. The lesion is isointense to cortical grey matter on all sequences. There is no surrounding white matter edema. A thin CSF intensity line is seen radiating from the lesion towards the adjoining cortex, likely representing a prominent perivascular space.