Paraganglioma: Ga-68 DOTATATE PET vs MIBG
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Question
A patient with biochemical evidence of a catecholamine-secreting tumor (elevated plasma metanephrines) has a negative CT of the adrenals. The nuclear medicine physician is choosing between MIBG scintigraphy and Ga-68 DOTATATE PET/CT for tumor localization. Which of the following statements is MOST accurate regarding imaging selection for paraganglioma?
- AGa-68 DOTATATE PET/CT generally has superior sensitivity to MIBG for paraganglioma, particularly for SDH-mutated (hereditary) paragangliomas that have high SSTR expression
- BMIBG scintigraphy is always superior to Ga-68 DOTATATE for paraganglioma
- CCT alone is sufficient for all paraganglioma localization
- DFDG PET/CT is the only approved modality for paraganglioma
Show the answer and explanation
A. Ga-68 DOTATATE PET/CT generally has superior sensitivity to MIBG for paraganglioma, particularly for SDH-mutated (hereditary) paragangliomas that have high SSTR expression
For paraganglioma localization, imaging selection should consider tumor genetics: (1) SDH-mutated paragangliomas (particularly SDHB mutations causing malignant paraganglioma) have high SSTR expression and are best imaged with Ga-68 DOTATATE PET/CT; (2) Sporadic head and neck paragangliomas (SDHx) also prefer DOTATATE; (3) Adrenal pheochromocytomas (especially sporadic or NF1/RET/VHL-related) typically respond well to MIBG; (4) I-131 MIBG therapy is used for metastatic MIBG-avid disease (pheochromocytoma/paraganglioma). Overall, Ga-68 DOTATATE PET/CT has shown superior sensitivity to MIBG for most paraganglioma subtypes in head-to-head comparisons.
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