Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . The heart is mildly enlarged , similar to prior , and exaggerated by technique and low lung volumes . The thoracic aorta is unfolded . Pulmonary vasculature is unremarkable . The lungs are clear without focal or diffuse abnormality . No pleural effusion or pneumothorax is noted . Osseous structures are unremarkable . No radiopaque foreign body .
    OUTPUT:
    
Unfolded thoracic aorta . Mild cardiomegaly . No acute cardiopulmonary process .