Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are again noted . The lungs are clear without focal consolidation , effusion , or edema . The cardiomediastinal silhouette is stable noting mild cardiomegaly . Aortic valve replacement is faintly visualized . Median sternotomy wires are intact . Left chest wall battery pack with lead projecting over the anterior chest wall is unchanged compared to prior . No acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary process .