TRIM21 and systemic sclerosis: No proteinuria, negative findings in skins and mucosa, negative anti-SS-A, anti-SS-B, anti-Scl-70 etc. excluded myositis secondary to lupus erythematosus, sicca syndrome, systemic sclerosis (SSc), etc. Considering that the myocardium injury in CMR was adjacent to the epicardium, endomyocardial biopsy might not provide positive findings, not to mention its invasiveness.