Right ventricular injection study in a normal dog. The dextro-phase shows the right ventricle (RV), pulmonary trunk (PT), and pulmonary artery branches. The left branch (LPA) always courses dorsal to the trachea (T) and the right branch (RPA) courses ventral to the trachea.

Continued right ventricular injection study in the normal dog. The levo-phase shows the left atrium (LA), left ventricle (LV), aortic sinuses of Valsalva (SV), ascending aorta (AA), brachiocephalic trunk (BT), left subclavian artery (LSA) and descending aorta (DA).