infiltration of leukocytes into skeletal muscle and around blood vessels. 1–3 Neutrophils,
eosinophils, or lymphocytes predominate depending on the inciting cause, which is in stark
contrast to most exertional myopathies that have macrophage infiltration of myofibers. 4, 5
Inflammatory myopathies are less well characterized than in other species, with extensive
overlap between myopathies with apparent infectious and immune-mediated components …