Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are lower compared to the previous exam , which accounts for the slight increase in size of the cardiac silhouette . Heart size does appear mildly enlarged . The aorta is calcified at the aortic knob . Mediastinal and hilar contours are normal . Pulmonary vasculature is not engorged . Patchy retrocardiac opacity may reflect atelectasis . There are likely small bilateral pleural effusions . No pneumothorax is present . There are no acute osseous abnormalities . No subdiaphragmatic free air is identified .
    OUTPUT:
    
Retrocardiac patchy opacity is likely reflective of atelectasis . Probable small bilateral pleural effusions .