Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable supine frontal chest radiograph demonstrates interval placement of a left central venous catheter , which crosses midline and courses superiorly , terminating either within the brachiocephalic or the right subclavian or internal jugular veins near their confluence . The remainder of the exam is unchanged , including cardiomegaly and diffuse pulmonary opacity suggestive of edema .
    OUTPUT:
    
Interval placement of a left central venous catheter , which terminates either within the brachiocephalic or the right subclavian or internal jugular vein near the confluence .