Investigation used for CSF rhinorrhoea are all except
Advanced nasal endoscopic techniques can be used for CSF leak repair but not for investigation. CT cisternogram requires intrathecal injection of iohexol and a CT scan to localize the site. b 2 transferrin proteindetection by electrophoresis is asensitive and specific test for CSF.
CT cisternogram
Skull X-ray
beta2 transferrin
Nasal endoscopy
FMGE 2019