John Hansen-Flaschen
Contributor
Professor of medicine, University of Pennsylvania, Philadelphia.
Primary Contributions (12)
Bronchiectasis, an abnormal expansion of the bronchial tubes in the lungs as a result of infection or obstruction. Usually the disorder occurs as the result of a preexisting lung disease, such as chronic obstructive pulmonary disease or allergic bronchopulmonary aspergillosis. Certain inherited…
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