Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest were obtained . Cardiomediastinal silhouette including cardiomegaly and tortuosity of the thoracic aorta is stable in appearance . Mild bibasilar atelectasis is again noted without large consolidation , effusion , or pneumothorax . Lung volumes remain low .
    OUTPUT:
    
No significant change compared to the prior examination and no definite evidence of pneumonia given low lung volumes .