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Polysaccharide Storage Myopathy - more common in horses than suspected
This is one of the results of a necropsy study on muscle biopsies of more than 200 horses and ponies. Any age group and any breed can be affected, but there are certain overrepresented breeds. A very informative study!

Muscle samples were obtained at necropsy from 225 horses and ponies 1 year of age or older. Samples were processed in routine manner and were stained with hematoxylin and eosin and with periodic acid-Schiff for glycogen.

Sections were examined for abnormal glycogen content and amylase-resistant complex polysaccharide and for chronic myopathic change (excessive fiber size variation, increase in number of internal nuclei).

A total of 101 horses and ponies with lesions of polysaccharide storage myopathy were identified.

Age of affected horses ranged from one to 30 years, with a mean of 14.7 years. Mean age of nonaffected horses was 12 years.

Incidence of polysaccharide storage myopathy varied depending on breed; Thoroughbreds had the lowest (27%) and draft-related horses had the highest (86%) incidence.

Chronic myopathic changes were more severe in polysaccharide storage myopathy-affected horses than in nonaffected horses.

Results of this study indicate that polysaccharide storage myopathy is a common disorder of many breeds of horses and ponies.



Source: B. A. Valentine, B. J. Cooper (2005): Incidence of Polysaccharide Storage Myopathy: Necropsy Study of 225 Horses. In: Vet Pathol 42:823-827 (2005)



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EQUINE

Head computed tomography in equine practicemembers
Computed tomography (CT) has become popular also in the diagnosis of equine patients, including lesions of the head. This retrospective study describes the findings in 59 horses presented with diseases of the head over 8 years that underwent CT examination of this region, including dental or sinonasal diseases (Group A) (n = 42), osseous and/or articular diseases (Group B) (n = 11) and soft tissue diseases (Group C) (n = 6). A very useful new study!

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