Findings of Magnetic Resonance Imaging after Optic Nerve Sheath Decompression in Patients with Idiopathic Intracranial Hypertension

In early postoperative period after ONSD, a fluid collection adjacent to the decompression site occurs in most eyes; this finding disappears in late period. Early postoperative MR findings support the idea that ONSD functions through the cerebrospinal fluid (CSF) filtration.