Neuroradiology of idopathic Intracranial Hypertension
Dr.Roopchand.PSSenior Resident AcademicDepartment of NeurologyTDMC, AlappuzhaNEURORADIOLOGY - IIH
INTRODUCTION: A disorder of unknown etiology. Affects young obese females Presents with features of raised ICT and papilledema. Otitic hydrocephalus – pre imaging era Pseudotumor ceribri – pneumatoencephalogram era Benign intracranial hypertension ? Vision Idiopathic intracranial hypertension.
DIAGNOSTIC CRITERIA: Modified Dandy criteria Signs and symptoms of raised ICT No localizing neurologic signs (exception of a unilateral or bilateral sixth nerve paresis) CSF may show increased pressure, but no cytologic or chemical abnormalities. Normal to small symmetric ventricles Diagnostic lumbar puncture done with the patient in the lateral decubitus position. MRI or MRV should be included to rule out intracranial venous sinus thrombosis. Other causes of intracranial hypertension should be ruled out
ETIOLOGY: Exposure to or withdrawal of drugs. Systemic diseases Disruption of cerebral venous flow Certain endocrine or metabolic disorders
CRITERIA FOR INCLUDING A DRUG OR ADISEASE AS A CAUSE OF IIH: Radhakrishnan et al.. At least 2 cases should have been described The reported cases should have met all the criteria for the diagnosis of IIH. Intracranial dural sinus thrombosis should have been ruled out with reasonable certaintyRadhakrishnan K, Ahlskog JE, Garrity JA, Kurland LT. Idiopathic intracranialhypertension. Mayo Clin Proc. Feb 1994;69(2):169-80