Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided dual - chamber pacemaker is noted with leads terminating in the right atrium and right ventricle . Mild cardiomegaly is similar . Aortic calcifications are most pronounced at the aortic knob . The pulmonary vascularity is not engorged . The lungs are hyperinflated with relative lucency in the apices compatible with emphysema . Minimal patchy opacity in the right lung base likely reflects atelectasis . There is no focal consolidation , pleural effusion or pneumothorax . Diffuse demineralization of the osseous structures is noted with mild decreased height of mid thoracic vertebral body , unchanged . Cholecystectomy clips are seen in the right upper quadrant of the abdomen .
    OUTPUT:
    
Minimal patchy opacity in the right lung base likely reflects atelectasis , though infection is not completely excluded .