Increased Urinary Excretion of 3-Methoxytyramine in Patients with Head and Neck Paragangliomas

Abstract

A substantial number of HNPGL patients have biochemically active tumors, reflected in increased excretion of 3-methoxytyramine, associated with increased dopamine excretion. Some patients only display increased excretion of 3-methoxytyramine, but not of other catecholamines or their metabolites.