Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post placement of a left - sided dual - chamber pacemaker , with leads terminating in the expected locations of the right atrium and right ventricle . There is no evidence of pneumothorax . Cardiomegaly is stable in appearance allowing for lower lung volumes , the latter also accentuate the pulmonary vascularity . New linear foci of atelectasis have developed in both lower lobes . Calcified granulomas are present in the right upper lobe without change . Note is made of previous median sternotomy and aortic valve replacement .
    OUTPUT:
    
Status post pacemaker placement with no evidence of pneumothorax .