Dysembryoplastic neuroepithelial tumour (DNET)


Final Diagnosis:

Left temporal: Dysembryoplastic neuroepithelial tumour.

Microscopic Description:

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.