Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right subclavian central venous catheter tip terminates in the proximal right atrium . Lung volumes are low . The cardiac , mediastinal and hilar contours are unchanged , with the heart size within normal limits . There is persistent elevation of right hemidiaphragm with adjacent right basilar atelectasis . No new areas of focal consolidation , pleural effusion or pneumothorax is identified . There is no pulmonary vascular congestion . Residual barium oral contrast material is noted in the left colon .
    OUTPUT:
    
No radiographic evidence for pneumonia .