Figure 2

Surgical findings. A: Intraoperative treatment for blood vessels. The tumor invaded the pulmonary trunk on the interlobar surface and also at the root of the posterior ascending branch. The branch was ligated and divided on the peripheral side. The pulmonary trunk was clamped with vascular forceps at the periphery proximal to the bifurcation of the anterior trunk, and the pulmonary trunk was then divided and sutured. The red area indicates the cancer invasion site. The brown area indicates the thrombus in the pulmonary artery. The double lines indicate the division sites of blood vessels. B: Macroscopically, the cancer showed continuous invasion of the pulmonary artery, and the pulmonary trunk was occluded with a massive thrombus.