Abstract
Acute bacterial and viral pneumonias present a diverse spectrum of radiographic features, causing considerable overlap in diagnostic possibilities. Nevertheless, certain radiographic findings can be quite useful in helping the radiologist to suggest an etiologic agent: (1) gross distribution of the infiltrate: bronchial distribution, unilobar or multilobar, upper or lower lobes, diffuse; (2) detailed features of the infiltrate: nodular, interstitial, multiple lucencies, alveolar or airspace consolidations; (3) complicating factors: pleural fluid, cavities, empyema, bronchopleural fistula. The judicious radiologist, using the proper combination of these observations and applying them in a given clinical situation, can often make a surprisingly accurate assessment of a pneumoma.
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