Necrotizing Cerebellitis and Cerebellar Atrophy Caused by Neospora caninum Infection: Magnetic Resonance Imaging and Clinicopathologic Findings in Seven Dogs
Article first published online: 15 MAR 2010
Copyright © 2010 by the American College of Veterinary Internal Medicine
Journal of Veterinary Internal Medicine
Volume 24, Issue 3, pages 571–578, May/June 2010
How to Cite
Garosi, L., Dawson, A., Couturier, J., Matiasek, L., De Stefani, A., Davies, E., Jeffery, N. and Smith, P. (2010), Necrotizing Cerebellitis and Cerebellar Atrophy Caused by Neospora caninum Infection: Magnetic Resonance Imaging and Clinicopathologic Findings in Seven Dogs. Journal of Veterinary Internal Medicine, 24: 571–578. doi: 10.1111/j.1939-1676.2010.0485.x
- Issue published online: 7 MAY 2010
- Article first published online: 15 MAR 2010
- Submitted October 22, 2009; Revised December 18, 2009; Accepted January 20, 2010.
- Labrador Retriever;
- Masticatory myositis;
Background: Adult dogs with neosporosis can develop a variety of neurologic signs. No area of predilection within the nervous system so far has been identified in adult dogs.
Objectives: To document neosporosis as a cause of progressive cerebellar ataxia and cerebellar atrophy in dogs.
Animals: Seven client-owned dogs.
Methods: Retrospective, descriptive study.
Results: Age at diagnosis ranged from 1 year 6 months to 9 years 11 months. Neuroanatomic localization indicated cerebellar and brainstem disease in 6 dogs and a central vestibular lesion in 1 dog. In all 7 dogs, there was moderate to marked bilaterally symmetrical cerebellar atrophy, with the atrophied cerebellum being surrounded by a region of T2-weighted hyperintense and T1-weighted hypointense signal. Cerebrospinal fluid (CSF) analysis in all but 1 dog showed mononuclear pleocytosis and high protein concentration. Polymerase chain reaction testing for Neospora caninum performed on the CSF was positive in 4/5 dogs tested and there was a high titer of serum antibodies to N. caninum (≥ 1 : 800) in all 6 dogs tested. Postmortem examination in 1 dog confirmed cerebellar atrophy and multifocal nonsuppurative encephalitis with areas of malacia and leptomeningitis. All of the remaining 6 dogs were treated with some combination of clindamycin, trimethoprim, sulfadiazine, and pyrimethamine. Two dogs were euthanized because of deterioration or relapse of neurologic signs, but treatment of the remaining 4 dogs resulted in improvement (3 dogs) or resolution (1 dog) of neurologic signs.
Conclusions and Clinical importance: Neosporosis is an important cause of progressive cerebellar ataxia and cerebellar atrophy in adult dogs.