title: Metrizamide CT cisternography and perioptic subarachnoid space imaging.
abstract: Opacification of the perioptic subarachnoid space (PSAS) is a normal occurrence. Opacification depends on the anatomy of the meningeal layers surrounding the optic nerves. To determine the reliability and the most efficacious technique for opacifying the PSAS, a retrospective study of 200 computed tomographic cisternography studies with water soluble contrast medium (metrizamide or iopamidol) was undertaken. Of these patients, 32.5% had opacification of the PSAS. Opacification was facilitated by examining the patients in the prone position. Demonstration of the PSAS was frequently noted in patients with empty sella and rhinorrhea.
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008793:Metrizamide; D008875:Middle Aged; D012189:Retrospective Studies; D013346:Subarachnoid Space / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed / Q000379:methods*
chemical_list: D008793:Metrizamide