Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well inflated . A right lower lobe opacity and small right pleural effusion are new since ___ . There is no pneumothorax . Cardiac and mediastinal contours are normal .
    OUTPUT:
    
Impression small right pleural effusion . Right lower lobe opacity more likely reflects atelectasis but developing infection can not be excluded .