A chest radiograph showing hyperinflation and an obstructive pattern on pulmonary function tests can help confirm the diagnosis. Bronchogenic carcinoma is a rare cause of chronic cough but needs to be considered if other causes seem unlikely. This is especially true in an elderly patient with a history of tobacco use. Bronchiectasis is generally evident based on history of previous pulmonary infections and an abnormal chest x-ray or high resolution CT scan. Interstitial lung disease may present with an insidious onset.
Crackles are frequently present on exam and radiographic studies are abnormal.
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