Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Dual lead left - sided pacemaker is seen with leads extending to the expected positions of the right atrium and right ventricle . Subtle right base patchy opacity may be due to atelectasis , however , mild aspiration is not excluded . No pleural effusion pneumothorax is seen . The cardiac silhouette is top - normal . The aorta is calcified . No pulmonary edema is seen .
    OUTPUT:
    
Subtle opacity projecting over the right lung base may be due to overlap of vascular structures with the posterior 10th rib , versus atelectasis , mild aspiration not excluded . No pulmonary edema .