IFIH1 and acquired idiopathic inflammatory myopathy: Although anti-MDA5+ DM is classified in the group of idiopathic inflammatory myopathies (IIM), which typically involve muscle tissue, it predominantly affects the skin with hypomyopathic or no muscle involvement and, more rarely, internal organs such as the lungs, with rapidly progressive interstitial lung disease (RP-ILD) (7, 8).