According to the International League Against Epilepsy, epilepsy can be diagnosed if any of the following criteria are met: at least two unprovoked seizures occurring on separate days (seizures within 24 hours count as one event); one unprovoked seizure with at least a 60% risk of recurrence over the next ten years on the basis of associated clinical factors (such as a recent stroke or brain tumour); diagnosis of a specific epilepsy syndrome. Convulsive events should be described rather than given a label. The EEG can establish the diagnosis of epilepsy and distinguish between focal and primary generalised epilepsy. An MRI brain scan is usually mandatory.