(i) Spontaneous intracranial hypotension patients confirmed by MRI or low CSF pressure on spinal tap (ii) Probable intracranial hypotension patients with a clear history of orthostatic headache (iii) Patients with follow-up data at least six months after the diagnosis and medical charts containing data on headache characteristics at onset, frequency, and intensity; MR imaging; and treatment with EBP
(i) Patients with previous head or spinal trauma (ii) Patients with lumbar punctures and/or spinal anesthesia (iii) Patients with possible causes for an orthostatic headache such colloid cyst of the third ventricle, intracranial neoplasm, sinusitis, cerebral venous thrombosis
