Medial View Focusing on the Anteromedial Basal Segment of the Left Lung

Description

Medial inspection of the left lung brings the mediastinal surface into profile, with attention drawn to the anteromedial basal segment of the inferior lobe (segmentum basale anteromediale, S7+S8 in common surgical groupings). The oblique fissure separates the superior lobe anteriorly and superiorly from the lower lobe posteriorly and inferiorly, while the diaphragmatic surface curves inferiorly toward the costophrenic recess. At the hilum, the left main bronchus lies posterior to the pulmonary artery, and the superior and inferior pulmonary veins sit anteroinferior, framing the segmental bronchovascular supply that courses toward the anteromedial basal parenchyma. Segmental anatomy matters when disease respects bronchopulmonary boundaries. Basal segment consolidation or atelectasis can localize to the anteromedial region of the left lower lobe, and on imaging it may silhouette the left heart border or extend toward the diaphragm depending on volume loss and fissural completeness. For thoracic surgeons, this medial perspective supports planning a left lower-lobe segmentectomy, where identification of the segmental bronchus and artery, and preservation of the adjacent basal segments, determines both margin control and postoperative function. A clean map. No guesswork. Educators can pair this illustration with CT anatomy teaching to explain why S7 and S8 are variably described on the left, and how segmental nomenclature translates to bronchoscopic navigation and operative reports. It also suits surgical atlases, radiology handouts, and preoperative consent materials that need a clear depiction of the left hilar relationships and the inferior lobe basal segments from the mediastinal side. Anatomical accuracy verified by SciePro's Medical Advisory Board.