Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The heart appears enlarged which may be secondary to low lung volumes . Increased retrocardiac opacity likely secondary to atelectasis in the setting of low lung volumes . No pleural effusion or pneumothorax is seen . The mediastinal silhouette is unremarkable .
    OUTPUT:
    
Low lung volumes and increased left basilar atelectasis . No focal consolidation detected .