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Ependymoma, Brain, Transverse Section at the Level of the Hippocampus, Dog.
The third ventricle contains a moderately well demarcated expansile mass (arrows) that has invaded normal tissue ventral to it. Moderate hydrocephalus is present in both lateral ventricles from blockage of the third ventricle.
(Courtesy Dr. M.D. McGavin, College of Veterinary Medicine, University of Tennessee.)
