Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild enlargement of cardiac silhouette which is unchanged . The mediastinal and hilar contours are stable . Pulmonary vasculature is normal . Patchy and linear opacities in the lung bases most likely reflect atelectasis . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Patchy and linear opacities in the lung bases are most likely reflective of atelectasis . Infection , however , can not be completely excluded .