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Review Question - QID 213711

QID 213711 (Type "213711" in App Search)
A 9-year-old boy is brought to a pediatrician for evaluation after he was recently adopted from abroad. He has an unclear past medical history though there is some concern that he may have developmental delay. On presentation, he is found to have the finding seen in Figure A. The mass feels firm on palpation though no tenderness is elicited. The mass also elevates when the boy swallows or sticks out his tongue. Which of the following most accurately describes the cause of this patient's mass?
  • A
  • A