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A 31-year-old man is brought in after his utility vehicle struck a tree at speed. He is pale and cold and speaks in short phrases. Heart rate 132/min, blood pressure 82/56 mmHg, respiratory rate 30/min. The trachea is central and the neck veins are flat. Breath sounds are absent over the left chest, which is dull to percussion. The chest wall moves symmetrically with each breath and the heart sounds are normal. The abdomen is soft and the pelvis is stable. He has no external bleeding. Which one of the following injuries accounts for his shock?
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