Оригинал
Some cause of intracranial hypertension are traumatic brain injury, while idiopathic intracranial hypertension has no known cause. Idiopathic-means "unknown ".
There are some who believe stenosis or narrowing of the venous transverse sinuses in the brain is the cause of idiopathic intracranial hypertension and thus makes it secondary intracranial hypertension.