Fig. 1

Preoperative chest computed tomography images and bronchoscopic image. Chest computed tomography (CT) revealed a tumor in the left inferior lobe (a) and hyperlobulation between S^1 + 2 and S³ (red arrow), while the interlobar fissure between S^1 + 2 and S⁶ was completely fused (b). CT revealed a displaced B^1 + 2 running behind the main pulmonary artery (c). Bronchoscopy revealed that three bronchi branched from the left main bronchus (d).