This book aims to provide readers practical information on the procedure of segmentectomy for early-stage lung cancer with the use of 3D reconstruction technology. The first chapters mainly focus on the basic knowledge of lung segmentectomy, such as its history, anatomy, indications and 3D reconstruction. In the following chapters, 12 different types of lung segmentectomies for early-stage lung cancer are introduced, including CT images, 3D reconstruction images, intraoperative mark figures. More importantly, exquisite hand-painted sketches are presented, which make the procedure of lung segment resection easy to understand. This case-based book will be a valuable reference for thoracic surgeons and those who are interested in related field.