Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size and mediastinal contours appear within normal limits . There is minimal opacity in the medial aspect of the right lung base which could reflect atelectasis although early consolidation can not be excluded . Apart from minimal bibasilar linear atelectasis , the left lung appears clear . There is no pleural effusion . The osseous structures show degenerative changes of the thoracic spine .
    OUTPUT:
    
Minimal opacity , medial right base , for which early consolidation can not be excluded .