Fig. 1From: Preservation vs. dissection of inferior pulmonary ligament for thoracoscopic upper lobectomy: a prospective randomized controlled trialMeasurement of bronchial angles. a The right bronchial angle: formed by the right intermediate bronchus and the midline of the trachea (extended line). b The left bronchial angle: formed by the left lower lobe bronchus and the midline of the trachea (extended line)Back to article page