Subependymal grey matter heterotopia
The patient has epilepsy with generalised seizures.
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Bilateral multiple subependymal nodules are seen, which have the same MR signal characteristics as the grey matter.
A retrocerebellar arachnoid cyst is also seen.
MRI of the brain demonstrates multiple subependymal nodules, which have the same MR-signal characteristics as the cortex, without any signs of contrast enhancement. This case illustrates typical features of subependymal grey matter heterotopia, which is a relatively common cause of epilepsy.