There is abnormal contour of the proximal descending aorta just distal to the origin of the left subclavian artery (abnormal contour of aortic isthmus), associated with luminal filling defect (flap) and surrounding loss of fat planes in the mediastinum, consistent with mediastinal haematoma. There is bilateral pleural effusion, more on the left side, with collapse of the left lower lobe. No contrast extravasation seen.
Interpretation: Features of acute aortic injury along with mediastinal and pleural haematoma.