Assessment of ICP in Idiopathic Intracranial Hypertension Using Transocular Ultrasound and Transcranial Doppler

PATIENT GROUP (ARM 1): Inclusion Criteria: * Age 18-65 * Patients in whom the IIH diagnosis is suspected/or confirmed * The diagnosis of migraine with or without aura or tension-type headache is allowed as a comorbid headache type. * Participants must read and understand the Danish language, or have an official interpreter present to be able to understand the work-up and sign the participation consent for the study Exclusion Criteria: * Pregnant or breastfeeding females * Patients who do not need a diagnostic lumbar puncture at the time of evaluation * Patients treated with acetazolamide, topiramate or furosemide for IIH or suspected IIH before inclusion in the study (baseline) * Any other primary or secondary headache diagnosis than migraine with or without aura or tension type headache as a comorbid disorder * Patients in whom the examination cannot be performed due to anatomical reasons such as severe head dysmorphia or severe ophthalmological diseases * Participants with secondary causes of raised intracranial pressure, or patients that have been treated for such (e.g. brain tumor, hydrocephalus, stroke or severe head injury) * Participants with known atherosclerotic disease or known heart disease CONTROL GROUP (ARM 2): Inclusion criteria: * Age 18-65 * Healthy persons who do not suffer from any form of primary headache except infrequent tension-type headache * Participants must read and understand the Danish language or have an official interpreter present to be a…