Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are moderately well inflated . There is a new subtle right lower lobe opacity is noted . No pulmonary edema . No pleural effusion or pneumothorax . The heart is top - normal in size , unchanged since prior examination . Mediastinal contour and hila are unremarkable . Intact median sternotomy wires and mitral valve prosthesis are noted . A left anterior chest wall pacer device lead tips are in the right atrium and right ventricle .
    OUTPUT:
    
New subtle right lower lobe opacity . Differential diagnosis includes atelectasis , early pneumonia or aspiration pneumonia ; clinical correlation recommended .