Histologic Changes

At low magnification, a bronchovascular bundle lies at the upper right: B = bronchiole, V = vein, A = pulmonary artery, L = lymphatic. Note that the vein and artery branches are on the same side of the airway.

The lymphatics occupy edematous interlobular septa. Normally, small veins also occupy these septa, but they are decreased in number here. In this entity, the larger pulmonary veins are located away from the bronchovascular bundle, as is normal.

The respiratory bronchioles and alveolar ducts of the acinus between the two marked lymphatics are normally formed, but alveoli are underdeveloped and too few. The pleura lies to the left.

Clinical summary Image 4

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