Imaging the Patient with Seizures
Seizures occur as a result of excessive, prolonged and synchronous electrical discharges of neurons within the brain parenchyma that alter neurologic function. Seizures may be acute or provoked such as in the case of a patient with a recent closed head injury, acute intracranial inflammatory process, or an acute cerebral infarct. The term “epilepsy” is applied to chronic, recurrent seizures. These seizures may be partial or focal in onset from a certain region of the brain such as the parenchyma adjacent to a neoplasm. Alternatively, the seizures may be generalized with simultaneous onset of the abnormal electrical activity from both cerebral hemispheres. If the data are insufficient to make these distinctions, the seizures are listed as unclassified. There is a higher incidence of partial seizures among all patients with epilepsy, but this varies with age. Generalized seizures are more common in early childhood while partial seizures increase in incidence with age such that partial seizures account for 75% of seizures in the elderly .
KeywordsPositron Emission Tomography Temporal Lobe Epilepsy Tuberous Sclerosis Focal Cortical Dysplasia Cortical Development
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- 4.Shields WD (1993) Neuroimaging in the diagnosis and management of pediatric epilepsy. In: Dodson WE, Pellock JM (eds) Pediatric epilepsy: diagnosis and therapy. Demos, New York, pp 99–106Google Scholar
- 9.Raymond AA, Fish DR, Sisodiya SM et al (1995) Abnormalities of gyration, heterotopias, tuberous sclerosis, focal cortical dysplasia, microdysgenesis, dysembryoplastic neuroepithelial tumour and dysgenesis of the archicortex in epilepsy: clinical, EEG and neuroimaging features in 100 adult patients. Brain 118:101–131CrossRefGoogle Scholar