Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Median sternotomy wires are intact . A right IJ sheath terminates at the origin of the SVC . There has been interval removal of a Swan - Ganz catheter and left chest tube . Cardiomediastinal and hilar contours are unchanged . Slight interval improvement in low lung volumes bilaterally . There is no pneumothorax . There is minimally improved , mild pulmonary edema . Right upper and left lower lobe opacities are unchanged and may reflect very mild alveolar edema . Probable , small left pleural effusion persists .
    OUTPUT:
    
Status post removal of left chest tube without evidence of pneumothorax .