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Background. An exact determination of aortic invasion by lung cancer is necessary for planning surgical intervention. We assessed whether or not the aortic wall is invaded by the tumor by transesophageal echocardiography (TEE). Methods. We studied 6 patients (mean age, 68.5 years) who had lung tumors located in the left upper lobe, and invasion to the aorta was strongly suspected but inconclusive. With the use of TEE, aortic invasion is represented by the disappearance of the outer hyperechoic layer of the aorta and the lack of synchronous movement of consolidation dur-

Assessment of Aortic Invasion by Lung Cancer With the Use of Transesophageal Echocardiography