Nodular cortical lesion without edema or mass effect. May have megagyric or multicystic appearance. Occasionally may enhance or contain calcifications. CT may show calvarial remodeling. Electron microscopy may demonstrate neuronal features.
Resection is usually curative.
Well-circumscribed, lobulated intraventricular mass. May be isointense to gray matter on both T1 and T2-weighted MR images. Rarely, spontaneous intraventricular hemorrhage. May involve corpus callosum. Rarely may arise in leptomeninges.