are used to orient regions (lobes or bronchopulmonary segments) of the lungs affected with sputum into positions whereby gravity can facilitate drainage 'downwards' toward the central airways.

Chest X-rays and CT scans typically show abnormalities that involve more than one region of the lungs. Lung function testing, while normal in mild cases, may show reduced lung volumes and low oxygen ...

People in low-income regions of South Asia and Sub-Saharan Africa have smaller lungs than people in Europe Airflow obstruction ... countries Other factors associated with obstruction of the airways ...

Lung cancer typically is diagnosed at a later stage than other malignancies, due to the lack of early warning indications. In 2020 it was China’s most common cancer and the leading cause of ...