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Severe polymyositis and neuritis in a cat
Adam A Ginman1, Karen L Kline, G Diane Shelton
1Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, USA.
Journal of the American Veterinary Medical Association
|July 16, 2009
Summary
A cat with severe immune-mediated polymyositis and neuritis showed rapid progression of lameness. Prompt diagnosis and long-term corticosteroid treatment led to complete motor nerve function recovery.
Area of Science:
- Veterinary Neurology
- Immunology in Animals
- Feline Medicine
Background:
- Immune-mediated polymyositis and neuritis (IMPN) are inflammatory conditions affecting nerves and muscles.
- These conditions can cause significant neurological deficits in cats, potentially leading to misdiagnosis or euthanasia.
- Early recognition and appropriate management are crucial for a positive outcome.
Observation:
- A 4-year-old domestic shorthair cat presented with a 1-week history of progressive tetraparesis and shifting limb lameness.
- Physical and neurological examinations revealed generalized muscle atrophy, pain on palpation, and diminished reflexes.
- Diagnostic workup included electromyography (EMG), cerebrospinal fluid (CSF) analysis, and nerve/muscle biopsies.
Findings:
- EMG showed positive sharp waves and fibrillation potentials, indicative of muscle denervation or irritation.
- CSF analysis revealed albuminocytologic dissociation, a common finding in inflammatory neurological diseases.
- Histopathology confirmed severe myositis and neuritis, supporting an immune-mediated etiology.
Implications:
- Prompt diagnosis and aggressive, long-term immunosuppressive therapy (corticosteroids) combined with physical therapy can lead to complete recovery.
- Awareness of immune-mediated polymyositis and neuritis is crucial to avoid premature euthanasia in affected cats.
- This case underscores the potential for a favorable prognosis in feline immune-mediated neurological disorders with appropriate veterinary intervention.
