Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Slight blunting of posterior left costophrenic angle may be due to a trace pleural effusion . There is mild bibasilar atelectasis without definite focal consolidation . Surgical clips are seen overlying the right heart border . Cardiac silhouette is mild to moderately enlarged . No pulmonary edema is seen . Aortic knob is calcified .
    OUTPUT:
    
Slight blunting of the posterior left costophrenic angle may be due to a trace pleural effusion .