Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is mildly enlarged . The aorta is tortuous . Mediastinal hilar contours are otherwise unremarkable . Pulmonary vasculature is not engorged . Linear and patchy opacities the lung bases most likely reflect areas of atelectasis . No pleural effusion , focal consolidation or pneumothorax is present . There are no acute osseous abnormalities identified .
    OUTPUT:
    
Patchy and linear bibasilar opacities , potentially atelectasis but infection or aspiration are not excluded .