Potential of observing the diameter of the optic nerve sheath using computed tomography in diagnosing high intracranial pressure in patients with spontaneous CSF rhinorrhea

Key points Spontaneous cerebrospinal fluid rhinorrhea (sCSFR) is often accompanied by an increase in intracranial pressure (ICP). The widening of optic nerve sheath diameter (ONSD) is an indicator of increased ICP. Using CT to measure ONSD is a simple and noninvasive auxiliary method for determining high ICP in sCSFR patients.