Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The mediastinal and hilar contours are unremarkable . The pulmonary vasculature is not engorged . Previously noted rounded opacity in the left upper lobe has resolved . Patchy opacities are noted in the both lower lobes , which may reflect atelectasis , however infection can not be completely excluded . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Patchy lower lobe opacities may reflect atelectasis , but infection is not excluded in the correct clinical setting .