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- Title
Masseter myodegeneration as a cause of trismus or dysphagia in adult horses.
- Authors
Pearson, E. G.; Snyder, S. P.; Saulez, M. N.
- Abstract
The medical records of eight horses with histological evidence of myodegeneration of the masseter muscles were examined. While they were alive their most common clinical signs had included difficulty in eating or opening their mouths, weight loss, difficulty in moving, and noticeable atrophy of the masseter muscles. The serum activities of muscle enzymes were abnormally high in all of the horses. Whole blood and/or liver selenium and vitamin E concentrations were less than the reference ranges in some of the horses. The lesions varied with the stage of the disease and consisted of swelling and discoloration, or muscle atrophy and fibrosis. Histologically, the muscle changes ranged from acute to subacuta degeneration, with regenerative changes accompanying ongoing degeneration, to chronic degeneration with fibrotic replacement of muscle tissue. There were changes in the masseter muscle of all the horses, hut some had widespread lesions in skeletal muscle, and a few also had myocardial lesions.
- Subjects
HORSES; DEGLUTITION disorders; TRISMUS; DEGENERATION (Pathology); MASSETER muscle; MASTICATORY muscles; VETERINARY medicine
- Publication
Veterinary Record: Journal of the British Veterinary Association, 2005, Vol 156, Issue 20, p642
- ISSN
0042-4900
- Publication type
Article
- DOI
10.1136/vr.156.20.642