Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph was provided . There is a left IJ central venous catheter in place with its tip in the region of the mid SVC . The heart size appears top normal . The lung volumes are low with bronchovascular crowding and presumed atelectasis in the lower lungs . There is no definite sign of pneumonia , large effusion , or pneumothorax . The mediastinal contour appears stable .
    OUTPUT:
    
Appropriately positioned left IJ central venous catheter . Top normal heart size .