Fig. 1

Chest computed tomography (CT) images and intraoperative findings of case 1. a Chest CT indicated the abnormal low-density area with an aberrant fissure in S9 and S10 in the left lung, as indicated by red arrows. b Two images obtained from three-dimensional reconstruction of chest CT findings: In the left image, red and green structures represent pulmonary arteries and bronchi, respectively. The yellow ellipse represents the abnormal region. In the right image, the red zone is the left upper lobe, and the blue zone is the left lower lobe. The green structures represent the bronchi. The yellow area indicates the lesion. Two images revealed no bronchi to the lesion. c The lesion attached to the normal lung by a peduncle. d Yellow mucus in the resected lung