Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates persistence of a small left - sided apical pneumothorax . There has been interval resolution of the previously seen hypodensity at the left lateral chest wall , now this region is homogeneously opaque , and may represent reaccumulation of pleural fluid . Stable - appearing interstitial abnormality in the right lung may represent pulmonary edema versus dissemination of tumor . Status post CABG with median sternotomy wires in place .
    OUTPUT:
    
Persistent small left - sided apical pneumothorax and resolution of hypodensity at the left lateral chest wall may suggest reaccumulation of fluid .