Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained . Heart is normal size , and cardiomediastinal silhouette is unchanged . Lung volumes are low , and left basilar opacities likely represent atelectasis ; however , developing consolidation can not be excluded . The right lung is clear . No pleural effusion or pneumothorax .
    OUTPUT:
    
Lower lung volumes with increased retrocardiac opacification , likely from atelectasis ; however , developing consolidation can not be excluded .