MRI features left subcortical cystic lesion with no restricted diffusion or enhancement suggestive of a neuroglial cyst.

On imaging, the main differential considerations include:

• porencephalic cyst
  • usually shows surrounding gliosis 
  • communicates with the lateral ventricle
• dysembryoplastic neuroepithelial tumor (DNET)
  • typically of cortical location
  • mixed signal intensity on FLAIR with bright rim sign
• multinodular and vaculating neuronal tumor (MVNT)
  • cluster of well-circumscribed high T2 signal "bubbles"
  • high signal on FLAIR
• arachnoid cyst 
  • typically extra-axial
• enlarged perivascular space
  • typically multiple
  • cluster around the basal ganglia
• neurocysticercosis 
  • usually <1 cm
  • partially enhance
• cerebral hydatid cyst
  • usually spherical
  • may be indistinguishable
• ependymal cyst
  • periventricular 
  • may be indistinguishable
• epidermoid cyst
  • restricted diffusion