Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta remains tortuous . Mediastinal and hilar contours are otherwise unremarkable and stable . Pulmonary vasculature is normal . Moderate size right pleural effusion is increased compared to the prior exam . There is associated right lower lobe opacity which likely reflects compressive atelectasis though infection can not be completely excluded . Left lung is clear . No pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Moderate size right pleural effusion , increased compared to the previous exam . Right lower lobe opacity may reflect compressive atelectasis but infection can not be excluded .