A 42-year-old man with a 2-year history of resistant hypertension presents with episodic headaches, palpitations, and profuse diaphoresis. Plasma fractionated metanephrines are elevated. CT abdomen shows the structure marked **A** — a heterogeneous adrenal mass measuring 4.5 cm with non-contrast Hounsfield units of 18, avid heterogeneous enhancement, and delayed washout <50%. Which of the following best describes the cellular origin and pathophysiology of this lesion?
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