Normally, a ventricle has just ONE outlet. For the left ventricle, this is the aorta. For the right ventricle it is the pulmonary artery. In DORV, both of these "outlet" blood vessels - aorta and pulmonary artery -arise from the RIGHT VENTRICLE, either totally or to a great extent. Most cases of DORV have a VSD. DORV is classified based on the relationship between the VSD and the blood vessels. If the VSD is right under the aorta, it is called DORV with Sub-Aortic VSD. If it lies under the pulmonary artery, it becomes DORV with Sub-Pulmonary VSD - also called the TAUSSIG-BING anomaly. If the VSD is under both the arteries, it is called DORV with Doubly Committed VSD. Sometimes, the VSD is farther away from the arteries, and is known as DORV with Non-Committed VSD. When in addition to this, there is narrowing of the pulmonary valve (Pulmonary Stenosis), the condition is similar to Tetralogy of Fallot (ToF). If the VSD is below the pulmonary valve, the features are just like those of Transposition of Great Arteries (TGA). When the VSD is doubly committed or non committed, clinical features are variable.