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CTA in SAH is of great value in demonstrating vascular anatomy and the exact size of an aneurysm. However, IA-DSA is still needed for diagnostic evaluation in aneurysms smaller than 5 mm in diameter, especially in those located near bony structures.

Six hundred lumbar radiculographies were performed with metrizamide in 581 patients. Excellent radiographs were obtained in almost all cases. The adverse effects were minor and no serious complications occurred. The authors consider metrizamide superior to other water-soluble contrast media in present use from both toxicological and radiological points of view.