Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size , and cardiomediastinal contour is unchanged compared to the prior study . Lungs are well expanded and clear bilaterally without focal consolidation , pleural effusion , or pneumothorax . There is no evidence of free air under the diaphragm . Gastric bubble is noted on the left .
    OUTPUT:
    
No acute intrathoracic abnormality .