Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Stable cardiomediastinal and hilar contours . Lower lung volumes compared to prior study with increasingly dense linear opacities at the bilateral lung bases , left greater than right , likely atelectasis . No focal opacification concerning for pneumonia . Mild pulmonary edema . No pleural effusion or pneumothorax evident . No osseous abnormality .
    OUTPUT:
    
No evidence of pneumonia . Decreased lung volumes compared to prior study . Mild pulmonary edema .