Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph demonstrates a severely widened mediastinum , correlating to the ascending and descending aortic aneurysm and Type B dissection . The aortic knob is not well visualized , and there is rightward deviation of the trachea . There is moderate to severe cardiomegaly . A left perihilar opacity corresponds to the mass seen on recent CT . A left pleural cap and left base opacity represent pleural effusion . There is no pneumothorax .
    OUTPUT:
    
Severely widened mediastinum with rightward deviation of the trachea , a left perihilar mass , and pleural effusion are unchanged from recent CT .