Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior radiograph , cardiomediastinal silhouette is grossly unchanged . Lungs are hyperinflated , but clear , without evidence of focal consolidation , pleural effusion , or pneumothorax . Small area of parenchymal sparing in the left upper lobe is unchanged . Mild degenerative changes of the thoracic spine again seen .
    OUTPUT:
    
No acute cardiopulmonary process .