One year in review 2016: idiopathic inflammatory myopathies

Idiopathic inflammatory myopathies (IIM) are a group of rare, acquired, clinically heterogeneous autoimmune inflammatory muscle disorders characterised by muscle weakness and multisystem involvement. Recently, new concepts about pathogenesis, diagnosis and treatment of these complex diseases have been provided. The purpose of this manuscript is to summarise the most relevant literature contributions published over the last year.