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Myopathies in Dogs and Cats

By

Joseph Harari

, MS, DVM, DACVS, Veterinary Surgical Specialists, Spokane, WA

Last full review/revision Nov 2020 | Content last modified Nov 2020

Myopathies can be congenital, hereditary Centronuclear Myopathy This inherited (autosomal recessive) condition is characterized by a type 2 muscle fiber deficiency and is now called centronuclear myopathy. Clinical signs are seen at L-carnitine supplementation... read more , idiopathic Fibrotic Myopathy in Dogs and Cats Fibrotic myopathy is a chronic, progressive, idiopathic, degenerative disorder affecting the semitendinosus, gracilis, quadriceps, infraspinatus, and supraspinatus muscles, primarily in dogs... read more , inflammatory Polymyositis in Dogs Polymyositis is a systemic, noninfectious, possibly immune-mediated, inflammatory muscle disorder in adult dogs. It may be acute or chronic and progressive. Clinical signs include depression... read more , metabolic, neoplastic Muscle Tumors in Dogs and Cats Primary skeletal muscle tumors can be benign (rhabdomyoma) or malignant (rhabdomyosarcoma). Secondary tumors involved with metastatic spread include lymphosarcoma, hemangiosarcoma, and adenocarcinomas... read more , traumatic Muscular Trauma in Dogs and Cats Infraspinatus contracture is a uni- or bilateral fibrotic myopathy of the infraspinatus muscle that is usually secondary to trauma in hunting or working dogs. Initial clinical signs include... read more , or due to nutritional imbalances Yellow Fat Disease in Cats and Other Animals Yellow fat disease is characterized by a marked inflammation of adipose tissue and deposition of “ceroid” pigment in fat cells. It may be seen alone in cats or with accompanying myopathy in... read more .

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Musculoskeletal
In all animals, the motor unit of skeletal muscle consists of the motor neuron, the neuromuscular junction, and muscle fibers. Muscle dysfunction—such as ataxia, paresis, or paralysis—most commonly originates in which of the following locations?
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