Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a left - sided pacer with the lead in appropriate position . There is no evidence of pneumothorax . There is a small left pleural effusion . Median sternotomy wires appear to be intact without evidence of fracture . There may be mild pulmonary vascular congestion ; otherwise , the hilar and mediastinal contours are unremarkable . Mild cardiomegaly is persistent . The visualized osseous structures are unremarkable .
    OUTPUT:
    
No evidence of a pneumothorax .