Surgery Most reliable sign of injury to intrathoracic aorta is – A Presence of apical cap of pleural fluid B Depression of left main stem bronchous C Obliteration of aortic knob contour D Funny looking mediastenum 💡 Explanation Most reliable sign of injury to intrathoracic aorta is - ✓ Correct Answer: C. Obliteration of aortic knob contour