Advances in noninvasive evaluation of congenital anomalies of the thoracic aorta.

Two-dimensional echocardiography, Doppler ultrasound, and magnetic resonance imaging (MRI) have greatly enhanced the noninvasive diagnosis of congenital anomalies of the thoracic aorta. Both sonic and magnetic resonance techniques can obviate preoperative invasive studies, and both provide an excellent means of follow-up. Ultrasound will likely remain the most valuable modality in neonates, while MRI promises to make an important contribution in older children and adults.