Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph obtained . Lung volumes are low somewhat limiting evaluation . Allowing for this , there is no definite sign of pneumonia or overt CHF . No large effusion or pneumothorax is seen . Heart size is likely normal given technique . Mediastinal contours are unremarkable . Previously noted left IJ central venous catheter has been removed . Bony structures are intact .
    OUTPUT:
    
Limited , negative .