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Figure 10a. Transposition of the great arteries at ECG-gated CT after an arterial switch operation and reconstruction of the atrial septum in a 17-year-old girl with a previous atrial switch procedure. CT was performed to exclude stenosis of the reimplanted coronary arteries. (a) Thin-section axial CT scan shows the ascending aorta (aA) after its transfer by means of the LeCompte maneuver from an anterolateral position (*) to a position posterior to the pulmonary trunk (PT). As is typical after this procedure, the ascending aorta appears to be embraced by the left pulmonary artery (lPA) and right pulmonary artery (rPA). The dilated right pulmonary artery compresses the superior vena cava (SVC). A stent was implanted into the superior vena cava to relieve the obstruction of blood flow. dA = descending aorta. (b) Thin-section oblique coronal image shows the former aortic root in the anterior position (*) and the pulmonary trunk (PT) embracing the repositioned ascending aorta (aA). IVC = inferior vena cava, LA = left atrium, RA = right atrium. (c) Thin-section oblique sagittal image shows the postsurgical location of the ascending aorta (aA) posterior to the pulmonary trunk (PT), which is dilated and compresses the aorta. RV = right ventricle.
