Progressive epilepsy-intellectual deficit, Finnish type (also known as Northern epilepsy) is a subtype of neuronal ceroid lipofuscinosis (NCL; see this term) characterized by seizures, progressive decline of intellectual capacities and variable loss of vision. The disease is Orphanet rare-disease nomenclature identifier Orphanet_1947 (Progressive epilepsy - intellectual disability, Finnish type). Also known as: CLN8 disease, Northern epilepsy variant, NCL, Northern epilepsy variant, Neuronal ceroid lipofuscinosis, Northern epilepsy variant, Northern epilepsy.