Bronchopulmonary Segments

The general pattern is a total of 18 segments—10 in the right lung and 8 in the left (Fig. 11.2). The main difference is that on the left side, the apical-posterior segment of the left upper lobe is considered as one segment, whereas apical and posterior segments of the right upper are considered as two separate segments. Also on the left side, there is no medial segment of the left lower lobe because of impingement of the heart on the left lower lobe.

Another difference is that on the left side, there is no middle lobe, rather a lingular portion which consists of a superior and inferior segment. This is unlike the right side where the middle lobe consists of a medial and lateral segment.

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