Magnetic resonance imaging of patients with epilepsy.

Magnetic resonance imaging (MRI) is the radiological investigation of choice for the evaluation of patients with epilepsy. It is able to detect and characterize the structural origin of seizures, and significantly influences treatment planning and prognosis. The indications for MRI, protocols used for MRI in epilepsy and the relevant imaging anatomy are discussed. The major categories of epileptogenic lesions which result in chronic seizures are reviewed and illustrated. Mesial temporal sclerosis is emphasized, reflecting its major importance as a cause of medically intractable epilepsy. The role of MRI in the planning and assessment of epilepsy surgery is considered.