Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . A cardiac valve replacement is noted . There is minimal residual right pleural effusion . Left effusion has resolved . Minimal basilar atelectasis persists . Otherwise the lungs are clear . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
Tiny residual right basilar effusion with mild bibasilar atelectasis .