Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal supine chest radiograph demonstrates low lung volumes . Cardiomediastinal silhouette is unremarkable within the limitations of technique and positioning . The lungs are clear without focal areas of consolidation , pleural effusions or pneumothorax . No definite displaced fractures are identified .
    OUTPUT:
    
No acute cardiopulmonary abnormality .