Segmentation of Normal Lung Lobes 2000.11.20

Segmentation of Normal Lung Lobes 2000.11.20

Lung lobe localization on X-rays is very important clinically. The left lung has two lobes, while the right lung has three. Typically, the left lung is 1–2 cm higher than the right lung. Each lung lobe is separated by interlobar fissures. The right lung has a horizontal fissure and an oblique fissure, while the left lung only has an oblique fissure. The right upper lobe consists of the apical segment, posterior segment, and anterior segment; the middle lobe consists of the lateral segment and medial segment; the lower lobe consists of the basal segment, external basal segment, anterior basal segment, posterior basal segment, and dorsal segment. The left upper lobe is divided into the superior part and the lingual part. The superior part is further divided into the apical-posterior segment and the anterior segment, while the lingual part consists of the upper lingual segment and the lower lingual segment; the lower lobe is divided into the dorsal segment, anterior basal segment, posterior basal segment, internal basal segment, and external basal segment.