[Preoperative 4D-CT Provided Helpful Evaluation of Aorta Invasion of Left Lower Lobe Lung Cancer].

A 73-year-old woman was diagnosed by bronchoscopic examination with primary left lung cancer (Adenocarcinoma, cT3N0M0, stage IIB), which was closely adjacent to the descending aorta in contrast enhanced computed tomography (CT). This CT did not reveal any invasion of a tumor into the descending aorta, and a dynamic fourth dimension CT (4D-CT) indicated that there was no invasion of the aorta by this tumor, so we decided to perform surgery. The operative procedure was a left lower lobectomy and lymph node dissection with the use of a thoracoscope. An intraoperative finding was that the tumor had not invaded the aorta. There are few reports about the evaluation of vascular invasion using the dynamic 4D-CT. We consider that the dynamic 4D-CT gave very useful information about vascular invasion.