Metrizamide Demonstration of the Subarachnoid Space Surrounding the Optic Nerves

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Abstract
Intrathecal instillation of metrizamide has provided a useful tool for the in vivo evaluation of smaller structures adjacent to or within the subarachnoid cisterns. A case of amenorrhea and galactorrhea in which metrizamide filled the thin subarachnoid space surrounding the optic nerve in its course through the orbit was reported. The finding appears to be infrequent since it was not observed in any instance in a review of 80 metrizamide computed tomographic cisternograms in patients with normal intracranial pressure.