Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view portable chest x-ray in upright position shows increased lung volume with flattening of the diaphragm , probably due to emphysematous changes . There are no nodules or consolidation suspicious for pneumonia . Heart size is moderately enlarged in patient who has had sternotomy for cardiac surgery . Blunting of the left costophrenic space is due to parenchymal scarring and mild fibrotic changes as characterized in CT abdomen of ___ . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
There is no sign of acute cardiopulmonary process .