Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained . Right central venous catheter is unchanged in position terminating in the lower SVC . Heart is normal in size and cardiomediastinal contour is stable . Lungs are clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No substantial change compared to the prior study and no evidence of pneumonia .