Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right Port - A - Cath tip projects over the expected region of the mid to upper SVC , unchanged . No significant interval change from the prior exam . Cardiomediastinal silhouette is unchanged . There is central pulmonary vascular prominence , unchanged . No pneumothorax , effusion , or edema .
    OUTPUT:
    
No significant interval change . This exam is not diagnostic for pulmonary embolus and does not exclude the presence of pulmonary embolus . If there is high concern , a Chest CTA or nuclear imaging study is recommended .