MRI demonstrates a T2 bright, T1 dark, enhancing mass just inferior to the aortic bifurcation. No suprarenal mass is identified. Findings most likely represent paraganglioma of the organ of Zuckerkandl. Note that the term pheochromocytoma refers to a paraganglioma arising within the adrenal medulla, making it technically incorrect as this mass is extra-adrenal.
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A SPECT-CT was obtained. What was the most likely tracer used?
A) I-131 MIBG
B) I-123 MIBG
C) F-18 FDG
D) T-99m MAA
E) T-99m HMPAO
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