Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low , there is new hazy opacity at the right lung base , potentially reflecting a pleural effusion . No pneumothorax seen . No consolidation . No definite rib fractures . Unchanged mild cardiomegaly . No frank pulmonary edema . Atherosclerotic calcification aortic arch .
    OUTPUT:
    
Possible new small right pleural effusion .