Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is air under the right hemidiaphragm which is likely due to prior instrumentation ( " Old mesh " ) . Otherwise the cardiomediastinal is unremarkable . No pneumothorax is seen . Lower lobe opacities are seen .
    OUTPUT:
    
Air under the right hemidiaphragm likely due to instrumentation . Lower lobe opacities which likely represent atelectasis but could be infectious in origin given an appropriate clinical scenario .