A rare genetic non-syndromic cerebral malformation due to abnormal neuronal migration disorder characterised by variable-sized, focalised malformations located in any part(s) of the cerebral cortex, which manifests with drug-resistant epilepsy (usually leading to intellectual disability) and behavioural disturbances. Abnormal MRI findings (for example abnormal white and/or grey matter signal, blurred grey-white matter junction, localised volume loss, cortical thickening, abnormal gyral pattern, abnormal hippocampus) and variable histopathologic patterns are associated. [from
SNOMEDCT_US]