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Diagnosing epilepsy is not always easy or straightforward. It is usually a combination of tests and your seizure and medical history that confirm you have epilepsy – not a single scan. Most people have an EEG to look at how the brain is functioning, and possibly some sort of structural brain scan such as CT or MRI. It is very common to have these tests return normal.
If any scan is going to show positive for epilepsy it is most likely to be the EEG. Sometimes people with epilepsy do have lesions in their brain, such as scar tissue where the seizures generate, but if your brain scan shows a lesion, the doctor cannot definitely say this is epilepsy.