Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right pleural effusion with pleural thickening is mildly improved . There has been interval removal of a right pleural catheter . No pneumothorax is seen . Mild cardiomegaly is stable . There is 15 mm rounded opacity overlying the right anterior sixth rib not well visualized on prior chest x-ray or seen on most recent chest CT . A follow - up chest x-ray is recommended at 3 months . If the lesion persists , then chest CT is recommended to further characterize .
    OUTPUT:
    
1 . Mildly improved right pleural effusion . 2 . There is a 15 mm rounded opacity overlying the right anterior sixth rib . A follow - up chest x-ray is recommended at 3 months . If the lesion persists , then chest CT is recommended to further characterize .