Definition: Enlargement of air spaces distal to the TERMINAL BRONCHIOLES where gas-exchange normally takes place. This is usually due to destruction of the alveolar wall. Pulmonary emphysema can be classified by the location and distribution of the lesions.
in cattle is probably EMPHYSEMA, ACUTE BOVINE PULMONARY see PNEUMONIA, ATYPICAL INTERSTITIAL, OF CATTLE; DF: PULM EMPHYSEMA
ExamplesLung, Hyperlucent