Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size remains moderately enlarged but unchanged . The mediastinal contour is similar . There is mild pulmonary edema . Low lung volumes are present with minimal atelectasis at the lung bases . No pleural effusion or pneumothorax is present . Diffuse idiopathic skeletal hyperostosis is present within the thoracic spine .
    OUTPUT:
    
Mild pulmonary edema .