Fig. 1

Computed tomography of the chest. The heart size is enlarged. On the 3-dimensional volume rendered image (a), there is a common trunk of the ascending aorta and main pulmonary artery (PA). The aortic arch is right-sided and the pulmonary arteries are grossly dilated. On the coronal view (b), the tight narrowing at the beginning of right PA (white arrow) is where the migrated PA band from main PA locates. T: truncus; MPA: main pulmonary artery; LPA: left pulmonary artery; RPA: right pulmonary artery; AO: aorta