CT metrizamide myelography in syringomyelia

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Abstract
In a retrospective study of 32 patients with “proven” syringomyelia and 15 patients with an alternate proven diagnosis, a change in the caliber of the spinal cord with different positions (“collapsing cord sign or cord collapse”) had a sensitivity of 38% and a specificity of 87%. Central cord enhancement (“bull's-eye”) on delayed CT had a sensitivity and specificity of 91% and 87%, respectively. The positive predictive value of cord collapse was 87%, while the positive predictive value of central cord enhancement was 94%.

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