Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior study and allowing for differences in technique , the cardiomediastinal silhouette is probably unchanged . The posterior lower lobe opacity seen on the lateral view may be slightly denser and more confluent . Otherwise , allowing for technical differences , I doubt significant interval change in the bilateral opacities . No new superimposed opacity is identified . Doubt CHF . The 7 .1 mm rounded metallic density overlying the right upper / mid abdomen is compatible with a foreign body ( question more shrapnel ) . On the lateral view from the prior study it lies posterior to the presumptive L2 vertebral body .
    OUTPUT:
    
Bilateral multifocal patchy opacities . The CT report suggested that the appearance is most suggestive of a fibrotic subtype non-specific interstitial pneumonia ( NSIP ) . Allowing for technical differences , the posterior segment lower lobe opacity may be slightly more confluent . Otherwise , the appearance is grossly unchanged compared with ___