Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette is normal in size . Diffuse calcification of the aorta is noted . There is an opacity in the right lung base which may reflect atelectasis . A small right pleural effusion is present . The left lung is clear . No pulmonary edema is present . There is no pneumothorax . Clips are seen in the right upper quadrant of the abdomen .
    OUTPUT:
    
Right basilar opacity , possibly atelectasis , with small right pleural effusion , though pneumonia can not be excluded .