Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right IJ tip is in the mid SVC . Sternotomy wires are intact . Interval removal of left chest tube with a rounded opacity projecting over the posterior seventh rib is likely related to chest tube . Mild improvement in left lower lobe atelectasis . No additional focal opacity , pneumothorax or pleural effusion . Heart is mildly enlarged without pulmonary edema . Mediastinal contour and hila are normal . No bony abnormality .
    OUTPUT:
    
1 . Mild improvement in the left lower lobe atelectasis . 2 . No pneumothorax .