What is the most common cause of lobar atelectasis?

Name: What is the most common cause of lobar atelectasis?
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Bronchial obstruction is the most common cause of lobar atelectasis, as it prevents air from entering a specific region of the lung and causes collapse of the affected area. Loss of surfactant and viral pneumonia can also contribute to atelectasis, but they are not as frequent as bronchial obstruction. Pleurisy is an inflammation of the pleural lining and is not a direct cause of atelectasis.

What Is the Most Common Cause of Lobar Atelectasis