Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left anterior chest wall dual lead pacer is unchanged . Mild cardiomegaly is unchanged with unfolding of the thoracic aorta . Hilar contours are unremarkable . Mild atelectasis is noted at the posterior lung bases . Lungs are otherwise clear . Pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality .