Dysembryoplastic Neuroepithelial Tumor

Etiology: neoplasm
Imaging: temporal lobe (60%), megagyrus due to infiltration through the cortex
MRI: bubbly on T2, triangular in shape
Clinical: intractable seizures

Radiology Cases of Dysembryoplastic Neuroepithelial Tumor

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.