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Review Question - QID 107107

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QID 107107 (Type "107107" in App Search)
A 55-year-old man presents with complaints of intermittent facial flushing. He also reports feeling itchy after showering. On review of systems, the patient says he has been having new onset headaches recently. On physical exam, his vital signs, including O2 saturation, are normal. He has an abnormal abdominal mass palpable in the left upper quadrant. A complete blood count reveals: WBCs 12000/microliter; Hgb 18.2 g/dL; Platelets 385,000/microliter. Which of the following is most likely responsible for his presentation?