Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Hyperinflated lungs and vascular deficiency , mostly in the upper lobe zones , due to emphysema . Greater radiodensity in lower lungs is likely due to physiologic redistribution of blood . There is no focal consolidation , effusion , or pneumothorax . Specifically , there is no evidence of intrathoracic metastatic disease . Scarring in the left suprahilar area accounts for elevation of left hilus compared to the right . Mediastinal and cardiac silhouettes are normal . Old rib fractures on right .
    OUTPUT:
    
1 . No evidence of intrathoracic metastatic disease . 2 . Hyperinflated lungs and vascular deficiency in the upper lobes suggest obstructive disease . Greater radiodensity in the lower lungs is likely due to physiologic redistribution of blood .