17-year-old African-American male with recent history of immobilization after motor vehicle collision and acute onset of tachycardia.Axial contrast-enhanced chest computed tomographic image through lower lobe demonstrating small bilateral pleural effusions and peripheral opacities, some of which are wedge-shaped (arrows), consistent with parenchymal changes of pulmonary emboli (not shown on this). Additionally, there is subtle mosaic attenuation of lungs with lower lobes more opacified in respect to partially visualized right middle lobe and lingula, subtle indirect finding of pulmonary emboli due to nonuniform perfusion.