A 42-year-old man with a family history of multiple endocrine neoplasia type 2A (MEN 2A) is found to have bilateral adrenal masses on imaging. Plasma free metanephrines are markedly elevated. Which biochemical or imaging feature best distinguishes bilateral pheochromocytoma (as in MEN 2A) from a solitary pheochromocytoma with an incidental contralateral adrenal adenoma?

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