Evaluate for focus of seizures, pre-MRI for surgical candidacy: periventricular heterotopia and left temporal lobe seizures. There are numerous bilateral periventricular nodules with signal characteristics of grey matter. There is no evidence of intracranial hemorrhage or acute infarct. There is no abnormal intracranial enhancement. The lateral ventricles are enlarged and dysmorphic and there is deficiency of the septum pellucidum. There is a retrocerebellar arachnoid cyst that measures up to 25 mm in width. There is no midline shift or herniation. The major cerebral flow voids are intact. The orbits, skull, paranasal sinuses, and scalp soft tissues are grossly unremarkable.
Extensive bilateral periventricular heterotopia and enlarged lateral ventricles.