Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . However , there is a new right lower lobe airspace opacity with new volume loss and mild elevation of the right hemidiaphragm . The left lung is clear . There is no pneumothorax . The heart and mediastinum are magnified by the projection .
    OUTPUT:
    
New right lower lobe airspace opacity with associated volume loss is likely due to atelectasis , but pneumonia can not be excluded in the appropriate clinical setting .