Choroid plexus tumors in the dog.

Clinical and necropsy records for nine dogs with tumors of the choroid plexus were reviewed. In seven of the dogs, the tumors were on the left side of the fourth ventricle. All of the dogs were males, ranging in age from 13 months to 9 years. Upper motor neuron tetraparesis and positional nystagmus were the most common neurologic signs. Less frequently recorded were head tilt, vomiting, bradycardia, and signs of cranial nerve dysfunction. Alteration in consciousness was evident in four of the dogs and ranged from personality changes to coma.