Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: . Lung volumes are slightly low , with compressive changes at the bases . Cardiomediastinal silhouette is within normal limits . There is no focal consolidation , pleural effusion , or pneumothorax . There is no free air under the diaphragm .
    OUTPUT:
    
No acute intrathoracic abnormalities and no evidence of free air under the diaphragm .