Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . The mediastinal and hilar contours are remarkable . There is a patchy posterior basilar opacity , likely within the right lower lobe . It is difficult to exclude a trace pleural effusion on the left noting posterior blunting along the costophrenic sulcus . Slight degenerative changes are noted along the thoracic spine .
    OUTPUT:
    
Patchy right lower lobe opacification , probably compatible with atelectasis noting elevation of the right hemidiaphragm , although pneumonia is hard to entirely exclude .