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Metrizamide CT cisternography and perioptic subarachnoid space imaging
Journal of Computer Assisted Tomography
|December 1, 1981
Summary
Opacifying the perioptic subarachnoid space (PSAS) is a normal finding, often seen in patients with empty sella or rhinorrhea. The prone position best facilitates PSAS opacification during CT cisternography.
Area of Science:
- Neurology
- Radiology
- Ophthalmology
Background:
- Perioptic subarachnoid space (PSAS) opacification is a standard radiological observation.
- Its occurrence is linked to the anatomical configuration of the meningeal layers around the optic nerves.
Purpose of the Study:
- To evaluate the reliability and efficacy of techniques for achieving PSAS opacification.
- To identify factors influencing PSAS opacification during computed tomographic cisternography.
Main Methods:
- Retrospective analysis of 200 computed tomographic (CT) cisternography studies.
- Utilized water-soluble contrast agents like metrizamide or iopamidol.
- Assessed opacification rates and influencing patient positioning.
Main Results:
- 32.5% of patients demonstrated PSAS opacification.
- Prone patient positioning significantly facilitated PSAS opacification.
- Opacification was more common in individuals with empty sella and rhinorrhea.
Conclusions:
- CT cisternography is a reliable method for visualizing the PSAS.
- Prone positioning is the most effective technique for PSAS opacification.
- PSAS opacification is frequently associated with specific anatomical variations like empty sella and rhinorrhea.