Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild to moderate cardiomegaly is stable . The mediastinal and hilar contours are unchanged . There is no pleural effusion or pneumothorax . There is no focal consolidation concerning for pneumonia . There is stable appearance of a linear opacity at the left lung base since ___ , which may reflect atelectasis or scarring . Paucity of vessels at the lung apices indicates emphysematous changes .
    OUTPUT:
    
No acute cardiothoracic process .