Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Allowing for projection the heart is within normal limits in size . The aortic knob is slightly prominent . The pulmonary vessels are not congested . There are no pulmonary opacities . No pleural effusion . Left subclavian line in SVC . Nasogastric tube in stomach .
    OUTPUT:
    
No signs of pneumonia .