Canine Bilateral Extraocular Polymyositis

In Golden retrievers
Very rare
Clinical signs:
- Acute bilateral exophthalmos
Involves only extraocular muscles except for retractor blbi
Grossly:
- Swollen and pale extraocular muscles
Histologically:
- Sterile myositis
- Multifocal necrosis of myofibres
- Lymphocytic, histiocytic and plasmacytic infiltrate with few neutrophils