Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Normal heart size , mediastinal and hilar contours . Calcification of the aortic arch is noted . Opacity in the left lower lobe could reflect interstitial lung disease or in the appropriate clinical setting pneumonia . No pleural effusion or pneumothorax . Height loss of multiple mid thoracic vertebral bodies is present .
    OUTPUT:
    
Opacity in the left lower lobe could reflect interstitial lung disease or , in the appropriate clinical setting , pneumonia . Interstitial lung disease could be better assessed with chest CT .