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A 53-year-old woman presented with effort-induced chest pain during daily activities and similar symptoms with trunk flexion. A treadmill exercise test revealed a Mobitz II atrioventricular block. Coronarography and computed tomography confirmed the diagnosis of anomalous origin of the right coronary artery from the left coronary sinus, so surgical revascularization was indicated. We discuss the peculiarity of the clinical presentation and its possible pathogenic mechanism.