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Sawtooth cardiomyopathy (STC) is a kind of left ventricular (LV) dysplasia which was falsely classified as a variant of LV noncompaction. Here, we report a young man case with presyncope and dyspnea during exercise. Echocardiographic and cardiac magnetic resonance features showed multiple ridge-like projections of compacted myocardium in the inferior and lateral wall which was compatible with diagnosis of STC.