Fig. 2

Intraoperative findings. A, B There was widespread inflammatory lymph node infiltration around the A2. C, D The A2 lesion coupled with the bronchus was treated using an auto-stapler (black; 4.2-mm cartridge). E The schema of treatment for A2 and the upper lobe bronchus. F No cancerous tissue was found at the bronchial stump, and a lymph node with silicotic nodules was found between the pulmonary artery and bronchus. Scale bar: 500 μm. LN, lymph node; ULB, upper lobe bronchus; Tr-sup, superior arterial trunk; MLB, middle lobe bronchus