Partial Seizure with Secondary Generalization
Unlike partial seizures that affect a relatively small region of the brain, partial seizures with secondary generalization spread to involve the entire brain. Such events typically result in a convulsive tonic-clonic seizure. Depending on the direction that the abnormal electrical activity spreads, atonic or tonic seizures may result instead. Often partial seizures with secondary generalization begin with an olfactory or other sensory hallucination, called an aura. If an individual's seizures typically begin in this way, the aura can serve as a warning that a seizure is occurring and that a larger seizure is likely.