Syringomyelia is a condition where a fluid-filled cavity, called a
syrinx, develops in the spinal cord. Often a syrinx arises as a result
of pressure in the spinal canal and obstruction of the cerebrospinal
fluid. The syrinx can grow and injure the spinal cord and nerves. It
can be caused by a Chiari malformation, congenital process, tumor or trauma.