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End-Stage Hydromyelia, Spinal Cord, Dog.
The white and gray matter of the spinal cord are missing as a result of compression atrophy from a space-occupying, fluid-filled central canal. The only recognizable remnants of nervous tissue is the dura (arrows). In less severely affected animals, there would be variable dilation of the central canal of the spinal cord with much less severe compression atrophy.
(Courtesy College of Veterinary Medicine, University of Tennessee.)
