In another clinic, due to lack of cutaneous signs for dermatomyositis, muscular dystrophy was first assumed, and investigation of a tailored genetic panel revealed no pathological mutation in the included genes (ANO5, CAPN3, CAV3, DYSF, FKRP, GAA, MYOT, PYGM, SGCA, SGCB, SGCD, SGCG, TCAP). Here, PYGM is linked to muscular dystrophy.