Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: When compared to most recent exam , there has been no significant interval change besides the removal of left - sided chest tube seen on prior . Left basilar opacity suggests small residual effusion . Right perihilar opacity is unchanged as well as surgical chain sutures at right upper lung . Cardiomediastinal silhouette is stable . No acute osseous abnormality is identified .
    OUTPUT:
    
Persistent left basilar opacity suggestive of residual effusion . No definite interval change since prior .