The term can refer to dilatation of the persistent central canal of the spinal cord which communicates with the fourth ventricle (cavity wall is lined by ependyma).
It is similar to, but quite distinct from syringomyelia where there is dissection through the ependymal lining of the central canal.
It is very difficult to distinguish hydromyelia from syringomyelia and hence the collective terms hydrosyringomyelia or simply "syrinx" are sometimes used to refer to a fluid collection within the cord.
- 1. Boon NA, Colledge NR, Walker BR et-al. Davidson's Principles and Practice of Medicine, 20th Edition. Churchill Livingstone. (2006) ISBN:0443100578. Read it at Google Books - Find it at Amazon
- 2. E.Brant MW, A.Helms MC. The Brant and Helms Solution. Lippincott Williams &Wilkins. (2007) ISBN:B0011ZYZR2. Read it at Google Books - Find it at Amazon