Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: When compared to prior chest x-ray , there is wide mediastinum noting lack of clear delineation of the aortic knob with increased density lateral to the descending thoracic aorta . Trachea is also deviated to the right . Findings are compatible with known ruptured subclavian artery pseudoaneurysm as seen on same day chest CT . Cardiac silhouette is within normal limits . No focal consolidation identified . There is no large pleural effusion .
    OUTPUT:
    
Abnormal contour of the mediastinum compatible with patient 's known ruptured subclavian artery pseudoaneurysm .