Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable upright frontal image of the chest . Median sternotomy wires are noted , unchanged from prior exam . The lung volumes are low with associated bronchovascular crowding . The lungs are otherwise clear . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is midly to moderately enlarged , similar to prior exam .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Mild to moderate cardiomegaly .