EXOSC10 and myositis disease: All expert-defined cases of IMNM were subtyped as PM by the EULAR/ACR criteria, as were the large majority of OM cases (30/32), except 2 patients classified as DM, both with anti-PmScl antibodies and EULAR/ACR defined SSc, myositis and Gottron’s papules or a heliotrope rash, respectively.