There is no uniform cause: in 20% of the concerned, the LGS develops from the West syndrome. The medical history frequently includes infantile spasms or focalized and generalized seizures.
The most common type of LGS (70–78%) is symptomatic (secondary) - that is an identifiable underlying pathology is responsible. This includes encephalopathy (brain damage) or another disease and/or developmental disorder. Frequent causes include tuberous sclerosis, hereditary metabolic diseases, inflammatory brain disease such as encephalitis, meningitis, and toxoplasmosis; hypoxia–ischemia injury and other birth injuries; and lesions of the frontal lobe. These patients tend to have a worse prognosis than the idiopathic ones.
In up to one-third of cases no cause can be found. These cases are referred as cryptogenic and/or idiopathic Lennox–Gastaut syndrome. Patients are considered to have idiopathic LGS if they were developing normally prior to the seizures, and cryptogenic if a cause is suspected, but unknown. Not all investigators mention the second category.
Lennox–Gastaut syndrome, drug resistant/drug refractory epilepsy have been recorded with neurovisceral porphyrias including acute intermittent porphyria, hereditary coproporphyria and variegate porphyria. Care must be taken to avoid porphyrinogenic anti-seizure drugs in these cases. Diagnosis may be difficult in children who require enzyme or DNA testing.
Read more about this topic: Lennox–Gastaut Syndrome
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