Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . This accentuates the size of the cardiac silhouette which appears mildly enlarged . The aorta is unfolded . Mediastinal contours are unremarkable . No pulmonary edema , focal consolidation , pleural effusion or pneumothorax is present . Elevation of the right hemidiaphragm is re - demonstrated . Mild patchy bibasilar opacities may reflect atelectasis and / or scarring . Multilevel degenerative changes are seen in the thoracic spine with mild loss of height of a low thoracic vertebral body . Patient is status post left mastectomy .
    OUTPUT:
    
Low lung volumes . No definite evidence for pneumonia . Bibasilar atelectasis or scarring .