Abstract
PURPOSE: This study aimed to investigate the correlation between ONSD measured by USG and opening cerebrospinal fluid (CSF) pressure in cases of IIH. MATERIALS AND METHODS: This study employed a prospective observational design. It included 47 patients diagnosed with IIH. ONSD was measured using USG while opening CSF pressure was measured using LP. The study analyzed the correlation between ONSD, CSF opening pressure, and other variables. RESULTS: The study discovered a significant positive association between the measurements of right and left ONSD. However, the ONSD and opening CSF pressure were not significantly correlated. The axial length showed a negative correlation with ONSD. The study determined that an ONSD cutoff value of 5.67 mm was optimal for the prediction of high ICP. CONCLUSION: The investigation concluded that there is no significant relationship between ONSD distension and opening CSF pressure in IIH cases, suggesting that USG may not be reliable for estimating ICP. Frisen classification may have limited application in patients with chronic papilledema.