A 40-year-old woman with necrotizing pneumonia shows dilatation of the right lower lobe bronchi. Which mechanism best explains bronchial dilatation?

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Multiple Choice

A 40-year-old woman with necrotizing pneumonia shows dilatation of the right lower lobe bronchi. Which mechanism best explains bronchial dilatation?

Bronchiectasis results from loss of airway wall structure, not just surface lining. Chronic inflammation and infection activate inflammatory cells that release proteases, especially elastase, which degrade the elastic and other supporting components of the bronchial wall. As the elastic tissues and smooth muscle are damaged, the bronchi lose their recoil and become permanently dilated and flaccid. In necrotizing pneumonia, the intense inflammatory milieu accelerates this proteolytic damage, producing the characteristic dilation. Destruction of the mucosa alone wouldn’t create permanent dilation—the key change is the destruction of the wall’s supporting framework (elastic and muscular components) that normally keeps the airway caliber in check.

Bronchiectasis results from loss of airway wall structure, not just surface lining. Chronic inflammation and infection activate inflammatory cells that release proteases, especially elastase, which degrade the elastic and other supporting components of the bronchial wall. As the elastic tissues and smooth muscle are damaged, the bronchi lose their recoil and become permanently dilated and flaccid. In necrotizing pneumonia, the intense inflammatory milieu accelerates this proteolytic damage, producing the characteristic dilation.

Destruction of the mucosa alone wouldn’t create permanent dilation—the key change is the destruction of the wall’s supporting framework (elastic and muscular components) that normally keeps the airway caliber in check.

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