Multimodality Radionuclide Imaging in a Patient With Hereditary Paraganglioma-Pheochromocytoma Syndrome

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Hereditary paraganglioma (PGL)-pheochromocytoma (PCC) syndrome is a genetic disorder caused by a mutation of the tumor suppressor gene SDHD that results in a predisposition for head and neck PGLs and PCCs. We present a case of a 33-year-old woman where 18F-FDG PET/CT showed areas of increased uptake in both the adrenal and cervical regions, consistent with PCCs and PGLs, respectively. Further imaging revealed that PCCs were 123I-MIBG avid, whereas the PGLs were 111In-octreotide avid. This demonstrates the varying sensitivities of different imaging modalities in regard to neuroendocrine tumors and the potential for treatment using multiple targeted therapies.

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