Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . The pulmonary vasculature is not engorged . Patchy retrocardiac and left basilar opacities may reflect atelectasis , but infection is not excluded in the correct clinical setting . No large pleural effusion or pneumothorax is detected . Multiple remote right - sided rib fractures are again noted .
    OUTPUT:
    
Retrocardiac and left basilar patchy opacities , new in the interval , potentially atelectasis but infection is not excluded in the correct clinical setting .