Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes compared to prior study . There is a slightly increased haziness at the lung bases ; however , this may be due to lower lung volumes . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is stable . The aorta is tortuous and unchanged .
    OUTPUT:
    
No acute cardiopulmonary process .