Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low ; however , the lungs appear clear . Cardiomediastinal silhouette is top normal . No pleural effusion or pneumothorax . Rounded opacity in the left hemithorax correlates to the large left pulmonary artery on the CT of ___ .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .