Figure 14-72.

Astrocytoma, Brain, Transverse Section at the Level of the Thalamus, Dog.

The deep ventromedial area (thalamus/hypothalamus) of the right hemisphere (arrows) contains a poorly demarcated, nonencapsulated, expansile mass, which is a space-occupying lesion that has displaced the midline to the left and compressed the right lateral ventricle. The left lateral ventricle is mildly dilated, most likely from compression of the interventricular foramen.

(Courtesy Dr. M.D. McGavin, College of Veterinary Medicine, University of Tennessee.)