DermatomyositisPolymyositisMyositisParaneoplastic SyndromesLung Diseases, InterstitialMediastinal EmphysemaPanniculitisMuscle WeaknessHistidine-tRNA LigaseAutoantibodiesPrednisoloneRheumatic DiseasesLupus Erythematosus, CutaneousMuscle, SkeletalMyositis, Inclusion BodyBiopsyImmunosuppressive AgentsConnective Tissue DiseasesImmunoglobulins, IntravenousSkinTelangiectasisMicroscopic AngioscopyAutoimmune Diseases