Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Mild pulmonary edema and small left effusion are similar . A left chest pacemaker is new with its lead projecting over the expected positions of the right atrium and right ventricle on the single projection . Median sternotomy wires are intact . Aortic arch is calcified .
    OUTPUT:
    
1 . No pneumothorax status post pacemaker placement . 2 . Stable mild pulmonary edema and small left effusion .