Syringomyelia (also known as hydromyelia and syringohydromyelia) occurs when fluid collects within the spinal cord and creates a cyst. This type of cyst, referred to as a syrinx, grows over time. It typically begins in the neck, but can extend down the length of the spinal cord. Without treatment, a syrinx can damage the center of the spinal cord, causing permanent injury.
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