Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left - sided dual - chamber pacemaker device is noted with leads terminating in the right atrium and right ventricle . The cardiac , mediastinal and hilar contours are normal . The pulmonary vascularity is normal . Curvilinear opacity within the left lung base on the frontal view likely reflects atelectasis or scarring . No focal consolidation , pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary process .