*should be performed at initial investigation of aortic dissection.
*it may or may not reveal any abnormality. *Widening of the mediastinum is the classic finding (56-63%),
*abnormal aortic contour (48%),
- aortic knuckle double calcium sign >5mm (14%),
*pleural effusion (L>R), *tracheal shift, - left apical cap,
*deviated NGT.
*‘Normal’ in 11-16%
