Fig. 3

Intraoperative findings. Hyperlobulation was seen between S^1 + 2 and S³, and a largely fused fissure was observed between S^1 + 2 and S⁶ (a). The inferior pulmonary vein (IPV) was identified on the posterior side of the mediastinal pleura (b). In the process of peeling away the proximal V^1 + 2, we were able to clearly distinguish between B^1 + 2 and B⁶ on the posterior side (c). The branch of V^1 + 2 running between S^1 + 2 and S⁶ was used as a landmark when dividing the fissure between S^1 + 2 and the inferior lobe (d)