EFO_0010739 (epilepsy, early-onset, with or without developmental delay) can be described as follows. Early-onset epilepsy with or without developmental delay (EPEDD) is an autosomal dominant neurologic disorder characterized by the onset of generalized tonic-clonic seizures in the first days, months, or years of life. The severity is highly variable: some patients have normal psychomotor development and normal brain imaging, whereas others may show developmental delay associated with abnormalities on brain imaging.