Of the three cases that were classified as DM rather than PM by expert opinion, one had an anti-NXP2 antibody and calcinosis but no more specific DM cutaneous features and had no biopsy performed, one was seronegative but had perifascicular atrophy on biopsy and no rash and the final case was seronegative, had severe skin ulceration, severe ILD and MRI evidence of myoedema in the absence of demonstrable weakness and no biopsy was performed. Here, MORC3 is linked to Atrophy.