Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is somewhat rotated on today 's study , limiting assessment of the cardiomediastinal contour . Nonetheless , the cardiomediastinal contour is grossly unchanged compared to the prior study . There is a persistent right pleural effusion , this tracks superiorly over the apex of the lung . This appears grossly unchanged compared to the prior study . There is associated right basilar atelectasis . Airspace opacity in the right upper lung is similar in degree when compared to the prior study . This may reflect a combination of atelectasis and layering of the pleural fluid , however superimposed infection can not be excluded . There is evidence of prior rib resection in the right lower chest . The left lung appears grossly clear .
    OUTPUT:
    
No significant interval change when compared to the prior study . Abnormal opacity in the aerated portion of the right lung may reflect a combination of atelectasis and layering of the pleural effusion however infection can not be excluded .