Structural epilepsies are conceptualized as having a distinct structural brain abnormality that has been demonstrated to be associated with a substantially increased risk of epilepsy in appropriately designed studies. The structural brain abnormality can be acquired (such as due to stroke, trauma or infection) or may be of genetic origin; however, as we currently understand it, the structural brain abnormality is a separate disorder interposed between the acquired or genetic defect and the epilepsy.

Structural Cause

http://www.case.edu/EpSO.owl#StructuralCause