An Experimental Evaluation of Response to Contrast Media: Pantopaque, Iopamidol, and Iohexol in the Subarachnoid Space

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Myelography in dogs was performed with Pantopaque, iopamidol and iohexol. The effects of these agents were evaluated by histologic study of the brain, spinal cord, and meninges four months after the procedure. Retained Pantopaque was always accompanied by some degree of arachnoidal reaction, mild in the cervical cord segment and severe in the most caudal part of the cul-de-sac. No apparent protection against Pantopaque arachnoiditis was provided by either intrathecal or intramuscular methylprednisolone. We found no histologic evidence of arachnoiditis in animals examined with iopamidol and iohexol.

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