Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Hilar and cardiac contours are unremarkable ; however , there is a right upper mediastinal contour abnormality with partial obscuration of the right paratracheal stripe . There is also questionable medial displacement of the aortic calcifications at the level of the knob and descending aorta . Findings may represent aortic dissection in proper clinical setting . Atelectasis noted in the left lower lung with likely partial collapse of the medial aspect of the left lower lobe . No osseous abnormality evident .
    OUTPUT:
    
Findings raising concerning for aortic dissection . Recommend further evaluation with CT . Given patient 's contrast allergy and extensive area of calcifications , a CT non-contrast would be of utility .