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A 50-year-old man comes to the office due to a lump in his neck that has been present for 4 months and is enlarging. On examination, there is a firm, nontender, nonmobile mass in the right anterior neck. Otoscopic examination shows a clear right middle ear effusion. Needle biopsy of the neck mass is consistent with regional nodal spread of squamous cell carcinoma. Which of the following is the most likely site of the primary tumor?
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