Myositis and Fasciitis: Role of Imaging. 
Imaging plays an important role in the evaluation of patients presenting with possible myositis, with magnetic resonance imaging the most appropriate modality but ultrasound also playing a complementary role.  This article reviews the imaging appearance of the inflammatory myopathies, other forms of myositis, and mimickers of myositis, with a discussion of distinguishing features for each entity.  The fascia and disease processes that preferentially involve the fascia are also reviewed.