Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a moderate right - sided pleural effusion with adjacent atelectasis , not significantly changed from prior examination . However , there appears to be more prominent opacification of the right lung base . Small left pleural effusion is not significantly changed . There is no pneumothorax . Heart size is within the upper limits of normal . Calcification of the aortic arch is unchanged from prior . No acute osseous abnormalities .
    OUTPUT:
    
1 . Moderate right and small left pleural effusion are not significantly changed compared to the prior radiograph . 2 . Right lung base opacity appears more prominent . Differential includes atelectasis vs . pulmonary vascular congestion . Pneumonia could be considered in the appropriate clinical setting .