Aspiration Pneumonitis
Aspiration Pneumonitis

This is an image at a level near the carina. It shows ill-defined nodular opacities, several mm in diameter, predominating in the posterior right lung. The nodules are centrilobular in location, as most peripheral nodules are centered about 5 mm from the pleural surface (red arrows). Some of the opacities have a branching appearance (blue arrow). This is termed "tree in bud," and may be seen with pulmonary edema of various causes, hemorrhage, bronchopneumonia, hypersensitivity pneumonitis, follicular bronchiolitis, and other forms of small-airways disease. "Tree in bud" has been reported with aspiration. Click to next image for the image at the level of the middle lobe bronchus.