Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A small - to - moderate right pleural effusion has slightly increased in the interim . A small left pleural effusion is perhaps slightly smaller compared to the prior exam . Opacity in the lower lungs could be atelectasis of most concurrent pneumonia can not be excluded . No frank pulmonary edema or focal consolidation in the remaining aerated lung . Heart size is mildly enlarged , unchanged . Mediastinum is not widened . Median sternotomy wires , replaced cardiac valve , dual lead cardiac device are unchanged . Aortic knob calcifications are unchanged . No pneumothorax . No acute osseous abnormality .
    OUTPUT:
    
Persistent bilateral pleural effusions , small to moderate on the right and small left with adjacent opacities which could be atelectasis versus concurrent pneumonia in the appropriate clinical scenario .