4. Bronchiectasis - Gross
Bronchiectasis is the permanent dilation of bronchi and bronchioles and is secondary to a cycle of obstruction and infection. Note the inflamed left main stem bronchus, which opens into several branches in the left lower lobe that are opened and extend nearly to the pleural surface. The diameter of the two bronchial branches are each greater than the diameter of the bronchus at its origin, indicating the severity of bronchial dilatation. What are the causes of bronchiectasis? Answer
Why does it seem to affect the lower lobes preferentially? Answer

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