RT Journal Article SR Electronic T1 Delayed CT metrizamide enhancement of syringomyelia secondary to tumor. JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 73 OP 78 VO 4 IS 1 A1 S Kan A1 A J Fox A1 F ViƱuela A1 H J Barnett A1 S J Peerless YR 1983 UL http://www.ajnr.org/content/4/1/73.abstract AB Six cases of syringomyelia associated with intramedullary tumor were examined by metrizamide myelography and delayed computed tomography. All cases showed opacification of syringomyelic cavities 7-24 hr after myelography. This finding suggests that metrizamide can pass through the cord substance from the subarachnoid space into a syrinx cavity in noncommunicating types of syringomyelia. It supports the theory of transneural passage of fluid as part of the origin of such cavities. These cases also support the thesis that, in patients with cord cavities, tumor can be excluded only if the cavity is demonstrated within all areas of cord enlargement.