Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Bibasilar opacities are most compatible with atelectasis , difficult to exclude subtle pneumonia / aspiration . No large effusion or pneumothorax . Heart size can not be reliably assessed . Mediastinal contour appears unchanged allowing for slight rotation . Bony structures are intact .
    OUTPUT:
    
Bibasal opacities likely atelectasis , difficult to exclude subtle pneumonia / aspiration .