Figure 1.

Bilateral pulmonary contusion. Axial MDCT in lung window reveals (a) ill-defined nonsegmental areas of “ground glass” attenuation in middle lobe, right inferior lobe, and lingula in a polytraumatized patient, consistent with bilateral contusion focus (curved arrows). Also note a small right pneumothorax (straight arrow). Axial MDCT of another patient (b) shows “ground glass” lung contusions (arrowheads) and bilateral nonsegmental air space consolidations with a posterior distribution due to blood filling of the alveolar spaces.