Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Cardiomediastinal silhouette is within normal limits . Right hilus is slightly smaller , which may correspond to improved pulmonary hemodynamics . No evidence of pulmonary edema , pneumonia , or pleural effusion . No pneumothorax .
    OUTPUT:
    
Low lung volumes , otherwise clear lungs .