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MRI is the best test to se if the seizures have causes damage or not.
Actually MRI could detect the cause of the seizures as well as the damage. The damage includes changes in hippocampal and cerebellar volumes and neocortical volume. It could cause memory problems and mood disorders.
The change in the area could cause damage to memory. I think this means "damage" you mentioned.
Memory problem is a complication of seizures. If they are controlled with medications, the problem stays constant.