We present the case of PRKAG2 cardiac syndrome, a rare autosomal-dominant genetic disease characterized by peculiar clinical and electrophysiological abnormalities. We clearly show through the images the peculiar clinical features that should raise suspicion of a mutant PRKAG2 gene. Indeed, together with an accurate clinical and instrumental evaluation, genetic analysis can contribute to a correct diagnosis in order to promptly treat and prevent the complications of the disease.