Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a small right pleural effusion tracking superiorly into the minor fissure , essentially unchanged allowing for differences in technique . The known right infrahilar lung mass is partially obscured by adjacent atelectasis . Interstitial opacities within the aerated portion of the right lower lung could potentially represent lymphangitic carcinomatosis . Severe emphysematous changes including right greater than left apical bullae are noted . Heart size is top - normal . Cardiomediastinal and hilar silhouettes are unchanged .
    OUTPUT:
    
Probably unchanged small right pleural effusion .