Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The mediastinal and upper abdominal course of the nasogastric tube is obscured by marked motion artifact . However , the tip appears to lie near the gastric antrum . The moderate cardiomegaly is stable . The remainder of the examination is again limited by respiratory motion artifact .
    OUTPUT:
    
Limited examination due to respiratory motion , but tip of NG tube appears to lie near the gastric antrum .