DermatomyositisPolymyositisMyositisParaneoplastic SyndromesLung Diseases, InterstitialMediastinal EmphysemaPanniculitisMuscle WeaknessHistidine-tRNA LigaseAutoantibodiesLupus Erythematosus, CutaneousPrednisoloneMuscle, SkeletalRheumatic DiseasesMyositis, Inclusion BodyImmunosuppressive AgentsImmunoglobulins, IntravenousConnective Tissue DiseasesBiopsySkinMicroscopic AngioscopyTelangiectasis