Some people with transverse myelitis and other demyelinating diseases develop syringomyelia, a condition where a cyst forms from enlargement of the central canal in the spinal cord.

Wehner T, Ross JS and Ransohoff RM (2005). Fluid in the flute: Reversible hydromyelia. J Neurol Sci Non-communicating syrinx formation in association with demyelinating disease has been reported in approximately 50 patients. It has been unknown whether this is a permanent or potentially reversible phenomenon. We report a patient with acute transverse myelitis who developed a syrinx that resolved within 6 months. Mechanisms of syrinx formation in demyelinating disease are discussed. The Cleveland Clinic Foundation, Department of Neurology-S 90, 9500 Euclid Avenue, Cleveland, OH 44195, United States. http://www.ncbi.nlm.nih.gov/entrez/q..._uids=15972219