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Uncommon, slow growing mass with features intermediate between dysplasia and neoplasm

Superficial & supratentorial in location

Most common in temporal lobes.

Clinical:

Most patients adolescents or young adults

Seizures.

Pathology:

gyral expansion with small nodular elevations

Microscopic features:

Intracortical nodules composed mainly of glial cells

Oligodenroglial hypercellarity and mucin.

Frequently associated with adjacent cortical dysplasia.

Imaging:

Hypointense on T1

Markedly hyperintense on T2

Can be partially cystic and contain Ca++ and may be indistinguishable from oligodendroglioma on CT/MRI.

Typically nonenhancing

Large tumor cysts uncommon.