Dysembryoplastic Neuroepithelial Tumor

  • Etiology: Neoplasm
  • Imaging MRI:
    — Temporal lobe (60%)
    — Megagyrus due to infiltration through the cortex
    — Triangular in shape
    — T2WI: Bubbly in appearance
  • DDX:
  • Complications:
  • Treatment:
  • Clinical: Intractable seizures

Radiology Cases of Dysembryoplastic Neuroepithelial Tumor

CT and MRI of dysembryoplastic neuroepithelial tumor
Axial CT without contrast of the brain (above left) shows a right frontal triangular low density lesion. Contiguous axial FLAIR MRI of the brain (above right and below) show the triangular lesion to have bright signal in the white matter which extends into the cortex, giving an appearance of a megagyrus. The lesion did not enhance with contrast and did not show any diffusion restriction.
MRI of dysembryoplastic neuroepithelial tumor / DNET
Axial T1 without contrast (above left), T2 (above right) and T1 with contrast (below left) MRI of the brain show a round heterogenous lesion in the medial aspect of the left temporal lobe that appears to extend into the cortex, has a small amount of surrounding edema, and does not enhance. On gradient echo (below right) there is some hemosiderin staining in the lesion but no hemosiderin ring around it.