Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette and pulmonary vasculature are normal . Again noted are hyperinflated lungs and atherosclerotic calcifications of the aortic knob . No focal consolidation , pleural effusion , or pneumothorax is noted . A tiny nodular opacity in the left upper lung likely is reflective of subpleural changes seen on prior CT . It is stable since ___ .
    OUTPUT:
    
No acute intrathoracic abnormality