Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low causing mild crowding of the vascular structures . Otherwise , the lungs are clear without evidence of consolidation or edema . There is no pleural effusion or pneumothorax . The cardiac silhouette is mildly enlarged , but unchanged from prior exams . There is no free air below the hemidiaphragms .
    OUTPUT:
    
No acute cardiopulmonary process .