Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to prior chest radiograph from ___ , left pleural effusion remains unchanged with associated lower lobe opacity likely representing atelectasis or pneumonia . There are increased opacities at the right lung base , which likely represent atelectasis . The heart appears enlarged . There is mild pulmonary edema . Irregularity at the left humerus likely reflects the sequelae of prior injury .
    OUTPUT:
    
Unchanged left pleural effusion with associated lower lobe opacity could reflect atelectasis or pneumonia . Mild pulmonary edema .