Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size remains mildly enlarged . The aorta is tortuous . Pulmonary vasculature is not engorged . The hilar contours are unchanged . Lung volumes are lower than on the previous study with patchy opacities seen in the lung bases likely reflective of atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . Slight elevation of the left hemidiaphragm is unchanged . Moderate degenerative changes are again seen in the thoracic spine .
    OUTPUT:
    
Bibasilar atelectasis in the setting of lower lung volumes . No focal consolidation to suggest pneumonia .