| In addition, diagnostically important small structures, such as interlobular septa and distal arterioles and bronchioles, are not visualized. |
| Autopsy findings confirmed luminal narrowing of bronchioles by scarring, which is a histopathologic features of bronchiolitis obliterans. |
| The bronchi and bronchioles did not show epithelial changes, and the pulmonary arteries and arterioles were normal in appearance. |
| Air is forced into the trachea, bronchi, and bronchioles, where no gas uptake occurs. |
| The respiratory bronchioles, alveolar ducts, and alveoli occupy the space between the core and septal structures. |
| Not to be confused with bronchitis, bronchiolitis is an inflammation of the bronchioles, the smallest branches of the bronchial tree. |
