This name is applied to conditions in which the bronchial tubes contain decomposing matters, which irritate the bronchial wall and the corresponding lung parenchyma. There is, as in the preceding form, a lobular pneumonia, and the histological changes are somewhat similar, although with a greater tendency to suppuration.

The circumstances under which the bronchi contain acrid contents are somewhat various. Thus division of the pneumo-gastric nerve in animals leads to stagnation of the secretions of the bronchi and to a broncho-pneumonia. Similarly we sometimes have this condition in persons who have been long unconscious from disease of the brain, and in whom the bronchial secretion stagnates. In cases of bronchiectasis also there is often a great accumulation of putrid juices in the dilated bronchi, which may give rise to inflammation. Gangrene of the lungs and the presence of foreign bodies in the bronchi are also occasional causes of the condition under consideration. In these cases the putrid matters are sometimes carried inwards into the finer bronchi by the inspiratory current, and the resulting lobular pneumonia may be at parts distant from the original lesion. In such cases the name Insufflation pneumonia is sometimes applied. In new-born children there is sometimes a broiujho-pneumonia brought about by the insufflation of the amnionic fluid or of putrid fluids from the maternal parts.