Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly is present . The mediastinal and hilar contours are unremarkable . Pulmonary vasculature is not engorged . Patchy opacities are noted in the lung bases , which may reflect areas of atelectasis . Infection can not be completely excluded . No large pleural effusion or pneumothorax is identified . No acute osseous abnormalities seen .
    OUTPUT:
    
Mild patchy opacities in the lung bases may reflect atelectasis , but infection is not excluded in the correct clinical setting .