Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal chest radiograph demonstrates a right subclavian CVL tip within the right atrium , unchanged from previous examination . The lungs are well - expanded and clear . No pleural effusion or pneumothorax . Heart size , mediastinal contour and hila are unremarkable . No focal opacity . Limited assessment of the upper abdomen is unremarkable and visualized osseous structures are within normal limits . No subcutaneous emphysema .
    OUTPUT:
    
1 . Right CVL tip within right atrium , unchanged from radiograph 5 hr prior . 2 . No evidence of pneumonia .