Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . The moderate cardiomegaly is unchanged . The hilar and mediastinal contours are normal . There is no pneumothorax or pleural effusion . Pulmonary vascularity is normal .
    OUTPUT:
    
1 . No evidence of active or past infection with tuberculosis . 2 . Stable moderate cardiomegaly .