Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well - expanded and clear . A left chest wall pulse generator is unchanged in position , with leads terminating in the right atrial appendage , right ventricle , and left ventricle . There is no pneumothorax , pleural effusion , or focal consolidation concerning for pneumonia . The heart is mildly enlarged , but stable compared to the prior study .
    OUTPUT:
    
Stable mild cardiomegaly . No evidence of pneumonia .