Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A frontal supine view of the chest was obtained portably . There has been interval placement of a right pacemaker with the leads projecting over the expected locations of the right atrium and right ventricle . No focal consolidation , pleural effusion or appreciable pneumothorax . Mediastinal silhouette is slightly narrower . Heart size is unchanged .
    OUTPUT:
    
No appreciable pneumothorax .