Question
A 23-year-old man is brought to the emergency department by a coworker for an injury sustained at work. He works in construction and accidentally shot himself in the chest with a nail gun. Physical examination shows a bleeding wound in the left hemithorax at the level of the 4th intercostal space at the midclavicular line. Which of the following structures is most likely injured in this patient?
| A. | Left middle lobe of the lung |
| B. |
Right atrium of the heart |
| C. |
Left atrium of the heart |
| D. |
Left upper lobe of the lung |
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