Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette is obscured by low lung volumes and elevated diaphragm . The bibasilar opacities , more pronounced on the left , are likely atelectasis , however pneumonia is possible in correct clinical setting . Upper lungs are clear and there is no pulmonary edema . There is no appreciable pleural effusion or pneumothorax .
    OUTPUT:
    
Low lung volume . Bibasilar opacities , more pronounced on the left , are likely atelectasis , however pneumonia is possible in correct clinical setting .