Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiographs were obtained . The lungs are low in volume but clear . There is no pleural effusion or pneumothorax . The heart is top normal in size , accentuated in appearance by AP technique and low lung volumes , with normal cardiomediastinal contours . Dual - lumen catheter terminates in the right atrium .
    OUTPUT:
    
No acute intrathoracic process .