Idiopathic intracranial hypertension (IIH), also known as pseudotumor cerebri, is a disorder of increased intracranial pressure that occurs mainly in overweight women of childbearing years, often in the setting of weight gain.  Its cause is not known (hence the preferred name IIH). It is a syndrome characterized by increased intracranial pressure and its associated signs and symptoms in an alert and oriented patient, but without localizing neurologic ﬁndings. There is no evidence of deformity or obstruction of the ventricular system, and neurodiagnostic studies are normal except for increased CSF pressure and the related neuroimaging signs. Furthermore, no secondary cause of intracranial hypertension is apparent. IIH can either be self-limited or have a life-long chronic course.  
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