Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . There are no pleural effusions or pneumothorax . The lateral view depicts vague posterior basilar opacity projecting over the lower thoracic spine , not well depicted on the AP view .
    OUTPUT:
    
Abnormal posterior basilar opacification . The possibility of pneumonia could be considered in the appropriate clinical setting .