S¹⁺²⁺⁶ segmentectomy for a case of lung cancer arising in a displaced anomalous bronchus

Abstract

A 69-year-old woman was referred to our hospital because of an abnormal shadow detected on chest computed tomography (CT), which showed a partially solid nodule in the left S¹⁺² segment. In addition, a displaced anomalous B¹⁺²⁺⁶ bronchus arising from the left main bronchus was found behind the main pulmonary artery. Hyperlobulation between the S¹⁺²⁺⁶ segment and S³⁻⁵ and B⁸⁻¹⁰ segments was also noted on preoperative CT. The S¹⁺²⁺⁶ segment was independent of the other segments, and we performed left S¹⁺²⁺⁶ segmentectomy. There was no lymphadenopathy, and the lesion mainly showed a partially solid nodule on high-resolution CT. We therefore omitted subcarinal lymph-node dissection. We performed the operation safely by ascertaining the structure on 3-dimensional CT (3D-CT). We report the rare case of a displaced anomalous B¹⁺²⁺⁶ bronchus arising from the left main bronchus.