Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate well - circumscribed large masses within the left and right lower chest as well as the right mid chest in the infrahilar region . Given the well - defined borders of these masses , they may be pleural in origin , however , further imaging is needed to completely characterize . A small area of atelectasis is present in the left mid lung . There is no pleural effusion , pneumothorax or pulmonary edema . The heart size is normal .
    OUTPUT:
    
Bilateral lower lobe and right infrahilar masses may be of pleural or pulmonary origin . Further characterization with contrast - enhanced CT is recommended .