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A magnetic resonance imaging study shows that I have a gas-filled cyst in my spine. What causes them?

It is felt that gas filled cysts form when a disc containing gas is herniated. The gas then extrudes and can form within a cyst.

Reference: 

Y. Kudo et al. Gas-filled intradural cyst with migration into the nerve root of the cauda equina. J Neurosurg Spine. May 2008. Vol 8. Pp. 482-486.

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