Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is an increasing pleural effusion on the right , now at least moderate size , and probably a trace one on the left side . Associated opacity can probably be explained by atelectasis in the right lower and middle lobes . Projecting over the right mid lung is a rounded mass - like opacity measuring about 4 cm in diameter , possibly an increasing metastatic nodule . Patchy opacity at the left lung base is probably due to minor atelectasis . Compression deformities along the lower thoracic and upper lumbar spines are probably unchanged allowing for differences in technique . Known metastases into the bones are not well demonstrated on this study .
    OUTPUT:
    
Increasing right - sided pleural effusion . Right lung mass , probably increased substantially , although comparison of different modalities is not entirely reliable . CT may be helpful to evaluate further if needed clinically .