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Arachnoiditis of the lumbar spine. Displays the normal anatomy of the spinal meninges with labels for the dura mater, arachnoid and sub-arachnoid space. The remaining three illustrations portray the progression of arachnoiditis showing A. The irritated arachnoid layer and spinal nerves; B. Increased scarring and adhesions bind the arachnoid and begin encapsulating the spinal nerves; and C. Calcification and hardening of the spinal nerves.