A novel homozygous <i>PPP1R13L</i> frameshift variant in a child with syndromic dilated cardiomyopathy and fatal arrhythmia

<i>PPP1R13L</i>-related cardiomyopathy should be considered in children with early-onset dilated cardiomyopathy and syndromic features. Early diagnosis is critical for clinical management, arrhythmia surveillance, and appropriate family counselling.