RBM20 and familial dilated cardiomyopathy: These findings classify DCM-related genetic variants into three categories based on LGE patterns: subepicardial (seen in DMD, DSP, and FLNC), nonspecific (observed in TTN, BAG3, LMNA, and MYBPC3), and absent/rare (noted in TNNT2, RBM20, and MYH7).