Background The lobar and segmental anatomy are the basis for anatomical pulmonary segmentectomy. Methods From October 2017 to June 2021, 136 patients with small pulmonary nodules scheduled for anatomical pulmonary segmentectomy at our institution underwent three‐dimensional (3D) lung reconstruction. The anatomy of the left upper lobe (LUL) was statistically analyzed and graphically mapped using the reconstructed models, and the role of this reconstruction method in performing pulmonary segmentectomy was explored. Results Through the analysis of the reconstructed models, the upper stem (S1 + 2 + 3) bronchus was classified as having two (94/136 cases) or three branches (42/136 cases). The upper stem artery had two branches in 24/136 patients, three in 60/136 cases, four in 44/136 cases, and five in 8/136 cases. A total of 103/136 upper stem veins had two branches, 26/136 had three branches, and 7/136 had four branches. The lingual stem (S4 + 5) bronchus was two‐branched in 116/136 cases and three‐branched in 20/136 cases, while the lingual artery was single‐branched in 61/136 cases, two‐branched in 70/136 cases, and three‐branched in rare cases (5/136 cases). The lingual stem vein was unbranched in 119/136 cases and two‐branched in 17/136 cases. Additionally, six unusual variants (<5%) were identified: one in the bronchus, with four cases; three in the pulmonary artery, with six cases; and two in the pulmonary vein, with two cases. Conclusions 3D reconstruction can yield results similar to specimens for lung segment studies. The reconstruction strategy and the data presented in this article will be valuable references for thoracic surgeons performing anatomic resections.
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