Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A dual - chamber pacemaker is in stable and standard course and position from a left subclavian approach . No consolidation or edema is evident . There is linear atelectasis at both lung bases . Mild aortic tortuosity is noted . The cardiac silhouette is within normal limits for size . No effusion or pneumothorax is noted . The bones are diffusely osteopenic ; however , no clear displaced rib fractures are evident . There is mild hyperexpansion likely indicating underlying obstructive lung disease .
    OUTPUT:
    
Likely underlying COPD . No acute pulmonary process noted .