Muscles Inflammatory - Pathology

Myositis

Bacterial Myositis


Viral Myositis

Parasitic Myositis

Immune-Mediated Myositis

Idiopathic Myositis

Canine Polymyositis

Canine Bilateral Extraocular Polymyositis

Bovine and ovine eosinophilic myositis

  • Unknown aetiology
  • Major cell involved is eosinphil
  • Usually noticed at slaughter - green muscle discoloration
  • May be caused by degenteration of Sarcocystis spp.
  • Grossly:
    • Green discolored areas, well demarcated
    • Mostly in muscles of back and thighs
  • Histologically:
    • Massive eosinophil infiltration
    • Muscle fibres may degenerate
    • In old lesions - endimysial fibrosis, myofibre atrophy, some regeneration, lymphocytes, plasma cells, macrophages and few eosinophils
    • Capsule may form