%0 Journal Article %A Y Yamamoto %A K Kunishio %A N Sunami %A Y Yamamoto %A T Satoh %A M Suga %A S Asari %T Identification of CSF fistulas by radionuclide counting. %D 1990 %J American Journal of Neuroradiology %P 823-826 %V 11 %N 4 %X A radionuclide counting method, performed with the patient prone and the neck flexed, was used successfully to diagnose CSF rhinorrhea in two patients. A normal radionuclide ratio (radionuclide counts in pledget/radionuclide counts in 1-ml blood sample) was obtained in 11 normal control subjects. Significance was determined to be a ratio greater than 0.37. Use of radionuclide counting method of determining CSF rhinorrhea is recommended when other methods have failed to locate a site of leakage or when posttraumatic meningitis suggests subclinical CSF rhinorrhea. %U https://www.ajnr.org/content/ajnr/11/4/823.full.pdf