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Lateral temporal lobe seizures arising from the temporal-parietal lobe junction may cause complex visual hallucinations. [2] In comparison to mesial temporal lobe seizures, lateral temporal lobe seizures are briefer duration seizures, occur with earlier loss of awareness, and are more likely become a focal to bilateral tonic-clonic seizure. [2]
The abnormally thin cortex is a key factor that distinguishes this form of polymicrogyria from the others, which are characterized by an abnormally thick cortex. Most of the patients have cognitive and motor delay, spastic hemi- or quadriparesis, and seizures in varying degrees. The seizures also vary at age of onset, type, and severity.
MRI of a child experiencing seizures.There are small foci of grey matter heterotopia in the corpus callosum, deep to the dysplastic cortex. (double arrows) Gray matter heterotopia is a neurological disorder caused by gray matter being located in an atypical location in the brain.
The epileptic seizure in the vast majority of pediatric epilepsy patients is ephemeral, and symptoms typically subside on their own after the seizure comes to an end, but some children experience what is known as a “seizure cluster," in which the first seizure is followed by a second episode approximately six hours later.
Over 90% of children affected with lissencephaly have seizures. [ 2 ] Patients with subcortical band heterotopia (another disorder associated with pachygyria) typically have milder symptoms and their cognitive function is closely linked to the thickness of the subcortical band and the degree of pachygyria present.
Symptoms will vary according to where the seizure occurs. When seizures occur in the frontal lobe, the patient may experience a wave-like sensation in the head. When seizures occur in the temporal lobe, a feeling of déjà vu may be experienced. When seizures are localized to the parietal lobe, a numbness or tingling may occur.
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