Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . There is a new convex contour which appears immediately lateral to the upper part of the descending aorta . Otherwise , the mediastinal and hilar contours appear unchanged . There is no pleural effusion or pneumothorax . The lungs appear clear . Bony structures are unremarkable .
    OUTPUT:
    
A new contour abnormality along the aortopulmonary window . Etiologies may be vascular , projectional or potentially due to neoplasm . When clinically appropriate , a chest CT is suggested , preferably with intravenous contrast to assess further . An email was sent to the ___ nursing group regarding recommendation for chest CT on ___ .