Presence of a functioning pheochromocytoma.

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hy·per·chro·maf·fin·ism (hi″pər-kro-mafґĭ-niz-əm) a condition caused by excessive release of biogenic amines from chromaffin cells, as in pheochromocytoma; the major symptom is arterial hypertension.

Medical dictionary. 2011.

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