a: Gross anatomy of lung and thorax. b: Microscopic anatomy of bronchial wall. C: View of terminal airway and alveoli. d: Alveolar structure.

Bronchiolitis obliterans, commonly known as "popcorn lung," is a rare lung disease that happens when the smallest airways in your lungs (called bronchioles) become irreversibly inflamed and scarred.

Bronchiole Each bronchus splits again and again into thousands of smaller tubes called bronchioles which take the air deeper into the lungs. Alveoli At the ends of bronchioles are tiny air sacs ...