Colored Superior Lingular Segment of the Male Left Lung, Inferior View

Description

Oriented from an inferior perspective, the left lung is presented with the superior lingular segment (segmentum lingulare superius, S4) color-highlighted on the anteroinferior aspect of the upper lobe, immediately medial to the costal surface and approaching the anterior margin. Its inferior border relates to the oblique fissure separating upper and lower lobes, while medially the segment tapers toward the hilum where segmental bronchi and accompanying pulmonary arterial branches would enter. The lingula projects anteriorly and inferiorly over the cardiac impression, forming the left-sided counterpart to the right middle lobe. Seeing the superior lingular segment from below matters when you need to think in segments rather than lobes, because pathology in S4 often tracks along segmental bronchi and fissures rather than respecting broad surface landmarks. This orientation mirrors how the lingula is encountered during video-assisted thoracoscopic surgery, when the surgeon works along the oblique fissure and must differentiate lingular parenchyma from adjacent lower-lobe segments to achieve a targeted lingular segmentectomy. Segmental localization also sharpens radiologic correlation: lingular consolidation or atelectasis can silhouette the left heart border on chest radiography, and segment-based CT reporting commonly distinguishes S4 from the inferior lingular segment (S5). Use this asset for thoracic anatomy teaching in medical and PA curricula, for surgical atlases describing left upper-lobe segmentectomy, and for radiology education comparing lobar versus segmental disease patterns on CT. It also suits patient-facing materials explaining why a segmental resection can spare more functional lung than a lobectomy. Anatomical accuracy verified by SciePro's Medical Advisory Board.