
We undertook this study to 1) determine the sensitivity of the European Alliance of Associations for Rheumatology (EULAR)/American College of Rheumatology (ACR) classification criteria for idiopathic inflammatory myopathies (IIMs) to properly classify myositis‐specific autoantibody (MSA)–positive myositis patients, 2) describe the phenotype and muscle involvement over time in different MSA‐positive patients, and 3) compare MSA subgroups to EULAR/ACR criteria–defined myositis subgroups for their capacity to predict clinical phenotypes in patients with IIMs. The study included 524 MSA‐positive myositis patients from the Johns Hopkins Myositis Center. Each patient was classified using the EULAR/ACR classification criteria...
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