Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . Cardiac size is top - normal . The mediastinum is widened , could be the projection or enlargement / dilatation of the ascending aorta . The lungs are clear . There is no pneumothorax or pleural effusion . The osseous structures are unremarkable
    OUTPUT:
    
No acute cardiopulmonary abnormalities Widening of the mediastinum as described above further evaluation with CT should be considered