Dysembryoplastic neuroepithelial tumour (DNET)
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A small subcortical area of high T2 signal within the left temporal lobe is associated with faint contrast enhancement and does not suppress on FLAIR.
The patient went on to have a resection.
Sections show a circumscribed low-grade glial-neuronal neoplasm located within white matter, with focal extension into cortex. The lesion is characterized by microcystic spaces associated with intervening threads of glial tissue and aggregates of oligodendroglial-like cells. Floating neurons are evident. The lesion extends to an excisional margin.
FINAL DIAGNOSIS: Dysembryoplastic neuroepithelial tumour (DNET).