Dysembryoplastic neuroepithelial tumour (DNET)

Discussion:

The patient went on to have a resection. 

Histology

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).

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