|T||Truncus arteriosus||1 vessel|
|T||Transposition of great arteries||2 vessels switched; "egg on a string" heart|
|T||Tricuspid atresia||3 leaflet valve|
|T||Tetralogy of Fallot||4 findings: Pulmonary stenosis, RVH, VSD, aortic override; "boot shaped heart"|
|T||Total Anomalous Pulmonary Venous Return||5 vessels involved; "snowman" heart|
In TAPVR, the pulmonary veins do not drain into the left atrium. In the most common form Type I, the vessels form the left vertical vein and drain superior to the heart to the brachiocephalic, SVC or azygos vein. The left vertical vein forms the snowman's head. In Type II, the pulmonary veins drain to the coronary sinus. In Type III, they drain subdiaphragmatically to the IVC.
|TAPVR Type I (Supracardiac)|