= scarring in hippocampal area of temporal lobe. Commonly found on MRI in focal epilepsy (although focal EEG changes not always indicative of MRI abnormality, and other MRI lesions can account for temporal lobe epilepsy).
Often a history of febrile convulsions but unclear which comes first. Brain injury in early years from viral encephalitis or other cause often explains it.
Adjacent to language areas (assuming same side as language areas, which are usually on the left side in people who are right handed, but can be either side in people who are left handed) so seizures may affect speech. Also close to memory area so may not remember afterwards.
In people with drug resistant temporal lobe epilepsy, surgery can be useful.