Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest radiograph was obtained . The lungs are somewhat low in volume with a trace pleural effusion and atelectasis . The left lateral pleural thickening , previously described , appears to have resolved . Left rib deformities are noted . Multiple ___ are seen in place of 2 sternal wires projected intervally removed .
    OUTPUT:
    
Perhaps trace left pleural effusion and atelectasis . No pneumothorax .