Sylvian arachnoid cysts, temporal lobe hypoplasia and epileptic encephalopathy.
Clinical case. The authors describe a 14 year-old boy with bilateral arachnoid cysts of the sylvian area and temporal lobe hypoplasia. Also showed vermis and brainstem hypoplasia. Clinically manifest a severe encephalopathy with tetraparesia, autism and late onset polymorphic epilepsy. He presented a favorable outcome with valproate and vigabatrine. To the best of our knowledge only one case like ours has been reported.