Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are small bilateral effusions . There is also a retrocardiac opacity silhouetting the descending thoracic aorta and medial hemidiaphragm . Elsewhere , the lungs are clear . Cardiomegaly is similar in degree compared to prior . Atherosclerotic calcifications noted in the aorta with tortuosity of its descending portion . Hypertrophic changes noted in the spine .
    OUTPUT:
    
Small bilateral effusions and cardiomegaly . Retrocardiac opacity , potentially atelectasis although infection is not excluded , to be correlated clinically .