Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . The lungs are well expanded . Mild opacity at the right lung base is likely atelectasis but could represent early pneumonia in the appropriate clinical setting . No other opacity is seen . There is no pleural effusion or pneumothorax . Heart size is normal . Mediastinal silhouette and hilar contours are normal . No acute osseous abnormality or displaced rib fracture is seen .
    OUTPUT:
    
Right basilar opacity likely represents atelectasis but could be early or developing pneumonia in the appropriate clinical setting .