RT Journal Article SR Electronic T1 Delayed metrizamide CT enhancement of syringomyelia: postoperative observations. JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 613 OP 616 VO 6 IS 4 A1 Kan, S A1 Fox, A J A1 ViƱuela, F YR 1985 UL http://www.ajnr.org/content/6/4/613.abstract AB Delayed metrizamide computed tomography (CT) was performed both preoperatively and postoperatively in 11 syringomyelia patients. Change of syrinx size between the studies was easily assessed on CT. The morphologic change of the syrinx gave useful information about its continuity. One of our cases had reoperation as a result of this CT information. All cases with Chiari I malformation still showed filling of the syrinx cavity by metrizamide after posterior fossa decompression and obex plugging. This supports the idea that the abnormal fluid circulation maintaining syringomyelic cavities is more than just the flow through the obex to the central canal but may also be from fluid passage through the cord substance.