Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest . Heart size and cardiomediastinal contours are stable . There is increased lucency of the upper right hemithorax , likely representing severe panlobular emphysema . Retrocardiac atelectasis is similar to prior . No new focal consolidation or pleural effusion .
    OUTPUT:
    
Upper right hemithorax hyperlucency consistent with severe panlobular emphysema . Stable retrocardiac atelectasis .