Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the chest radiograph obtained approximately 2 weeks prior , no significant changes are appreciated . Lungs are fully expanded and clear without focal consolidation or effusions . There is unchanged dilation of the aortic knob and tortuous descending aorta . Cardiomediastinal hilar silhouettes are otherwise normal . Pleural surfaces are normal .
    OUTPUT:
    
No radiographic evidence of pneumonia or acute cardiopulmonary abnormalities .