Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left chest wall pacemaker generator obscures portions of the left hemi thorax . No left chest tube is definitively visualized . Lung volumes are lower with persistent retrocardiac opacity likely reflecting combination of effusion and atelectasis / consolidation . Mild pulmonary edema appears stable .
    OUTPUT:
    
No chest tube visualized in the left hemithorax , possibly obscured by the pacemaker generator .