Exploring Road of Classification Criteria for Idiopathic Inflammatory Myopathy

The “anti-synthetase syndrome” was well described in this classification which refers to association of interstitial lung disease (ILD), myositis, fever, mechanic's hand, arthritis, and antisynthetase autoantibody positivity. The Latest European League against Rheumatism/American College of Rheumatology Classification Criteria New criteria of IIM studied by International Myositis Classification Criteria Project were released in 2017 with improved sensitivity and specificity by 93% and 88% with muscle biopsy. [...]these criteria do not include MSAs except anti-Jo-1 antibody commonly used in practice and the criteria cannot distinguish the difference between PM and IMNM which are still in the same subgroup. [...]the recently held 224th ENMC further clarified IMNM[15] and new items for IMNM were added.