Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . There is persistent right basilar opacity compatible with an effusion with possible underlying atelectasis . There is calcification of the pericardium as seen on prior . The left lung is clear . Cardiac silhouette is unchanged .
    OUTPUT:
    
Persistent right - sided pleural effusion , not significantly changed . No definite acute cardiopulmonary process .