Pulmonary Anatomy and Variants

Published on 13/02/2015 by admin

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[level-membership-for-cardiothoracic-surgery-category]Chapter 3

Pulmonary Anatomy and Variants

Pulmonary Axial 1

Normal Variants

A thin, well-defined linear structure representing an inferior accessory fissure. An inferior accessory fissure segregates the medial basal segment of either lower lobe from the remaining basal segments. This variation is a common finding in the population and generally of no clinical significance.

Pulmonary Axial 2

Normal Variants

A thin, curvilinear structure extends through the medial right upper lobe, representing an azygos fissure—the lung subtended by the azygos fissure is referred to as the azygos lobe. The azygos vein courses through the azygos fissure. This anomaly is formed when the azygos vein extends into the right upper lobe during fetal development. The azygos fissure consists of 4 layers of pleura: 2 of visceral pleura and 2 of parietal pleura. This finding is a usually an incidentally detected anomaly, without clinical significance, and is found in 0.3% to 0.5% of the population.

Pulmonary Axial 3

Normal Variants

An anomalous bronchus originating directly from the right lateral trachea wall—this anomaly is known as a tracheal bronchus. A tracheal bronchus supplies all or a portion of the apical segment of the right upper lobe and is found in 0.1% of the population.

Pulmonary Coronal 1

Normal Variants

The coronal projection of the patient shown in Axial 3. The right upper lobe tracheal bronchus is seen to advantage.

[/level-membership-for-cardiothoracic-surgery-category][not-level-membership-for-cardiothoracic-surgery-category]Chapter 3

Pulmonary Anatomy and Variants

Pulmonary Axial 1

Normal Variants

A thin, well-defined linear structure representing an inferior accessory fissure. An inferior accessory fissure segregates the medial basal segment of either lower lobe from the remaining basal segments. This variation is a common finding in the population and generally of no clinical significance.

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