There are a variety of aortic arch anomalies, including coarctation of the aorta, interrupted aortic arch, and vascular rings, which present with clinical signs and symptoms. We report a unique case of an abnormal aortic arch as a spurious finding in the workup of an infant with a heart murmur. A 20-day-old previously healthy, term infant was admitted with respiratory synctial virus and progressive respiratory distress. Physical examination revealed a nonspecific grade 2/6 systolic ejection murmur audible along the left sternal border. Blood pressures in the arms and legs were normal and pulses were easily palpable in all extremities. An echocardiogram showed no intracardiac abnormalities, but suprasternal and subcostal imaging suggested an abnormal aortic arch [2] (Fig. 1) but failed to adequately define its course in the thorax. Magnetic resonance imaging (MRI) was performed to further clarify the arch anatomy [1]. Double-inversion recovery sagittal images show a tortuous and elongated but unobstructed proximal descending aorta (Fig. 2) coursing lateral and posterior to the usual course of the aorta, extending into the paraspinal region posterior to the level of the vertebral bodies. Despite the unusual course, the aorta remained widely patent throughout. This unusual aortic arch variant, which was poorly defined using two-dimensional echocardiography due to its traverse through several planes of sound, was clearly defined by MRI, thus preventing more invasive evaluation and verifying that intervention was unnecessary.