The purpose of this study was to present the characteristics and outcome of patients with proven pheochromocytoma or paraganglioma who had false-negative iodine-123 metaiodobenzylguanidine single photon emission computed tomography ((123)I-MIBG SPECT). Twenty-one patients with false-negative (123)I-MIBG SPECT (7 males, 14 females), aged 13-55 years (mean: 41.40 years), were included.
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