Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . There is no pneumothorax . Moderate cardiomegaly despite the projection is unchanged . The aortic knob is prominent as in the past , which correlates with tortuosity and mild dilatation of the distal aortic arch on CT scan .
    OUTPUT:
    
Clear lungs . Stable moderate cardiomegaly .