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Motor neuron degeneration in a horse
D L Step1, J F Cummings, A de Lahunta
1Department of Large Animal Medicine, School of Veterinary Medicine, University of Wisconsin, Madison 53706.
Journal of the American Veterinary Medical Association
|January 1, 1993
Summary
Diagnosing motor neuron degeneration in horses involves a thorough neurologic exam and ancillary tests. Muscle biopsy can reveal specific fiber atrophy, aiding in antemortem diagnosis of this equine neurological disease.
Area of Science:
- Equine neurology
- Veterinary pathology
Background:
- Motor neuron degeneration (MND) is a debilitating equine neurological condition.
- Early diagnosis is crucial for management and understanding disease progression.
Observation:
- A 9-year-old Quarter Horse mare presented with progressive weight loss, weakness, muscle atrophy, tremors, and behavioral changes.
- Clinical signs indicated a significant neurological disorder.
Findings:
- Diagnostic testing excluded several potential causes, including selenium deficiency, lead toxicity, and infections like pseudorabies and Lyme disease.
- Microscopic examination of neural tissues confirmed motor neuron degeneration.
- Muscle biopsy revealed scattered angular atrophy of skeletal muscle fibers (Type 1 or Types 1 and 2).
Implications:
- Antemortem diagnosis of equine motor neuron degeneration is achievable through a combination of clinical history, neurologic examination, and specific ancillary tests.
- Muscle biopsy findings, particularly angular muscle fiber atrophy, are key indicators for diagnosing MND in horses during their lifetime.