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©2013 UpToDate ® Print Email Two-dimensional transthoracic echocardiogram (2D TTE) from the suprasternal notch view showing the aorta and major branch vessels With the transducer at the suprasternal notch (panel A), the long axis of the aortic arch can be visualized (panel B). The circular right pulmonary artery (RPA) is seen under the arch just inferior to the air filled right bronchus (RB). Relative to the aorta, the RPA is one half the diameter. RSA: right subclavian artery; RCC: right common carotid artery; LCC: left common carotid artery; LSA: left subclavian artery; IN: inominate vein. The inominate artery is not labled. Image courtesy of Dr. Norman Silverman