Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Cardiomegaly is mild , similar to prior examinations . Pulmonary vasculature is unremarkable . The lungs are clear without focal abnormality . Hyperexpansion , similar to prior , is likely due to emphysema . No pleural effusion or pneumothorax . S - shaped scoliosis of the thoracolumbar spine is present . The osseous structures are otherwise unremarkable . No radiopaque foreign body .
    OUTPUT:
    
Mild cardiomegaly , similar to prior . No pleural effusion .