Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph ___ at 09 : 20 is submitted .
    OUTPUT:
    
There is a stable small left apical pneumothorax . The right subclavian PICC line is unchanged in position . The patient is status post median sternotomy with a mitral valve replacement and stable postoperative cardiac and mediastinal contours . There is worsening mild pulmonary edema , left greater than right . Stable retrocardiac consolidation may reflect lower lobe atelectasis in the setting of the layering effusion .