Tricuspid atresia and transposition of great arteries with juxtaposition of the atrial appendages

Classic appearance of tricuspid atresia and transposition of great arteries with juxtaposition of the atrial appendages, which give rise to pointed bulge on the left border of the mediastinal shadow below the region where the pulmonary artery should be seen. The right border of the right atrium is straight because the absence of the right ventricle pulls the border toward the right atrium. The mediastinal pedicle is narrow because there is transposition of the great arteries. The vascularity of the lungs is normal because the pulmonary stenosis is not severe.