Abstract
Aim
The aim of this study was to compare the accuracy of 123I-MIBG SPECT/CT with that of 18F-DOPA PET/CT for staging extra-adrenal paragangliomas (PGLs) using both functional and anatomical images (i.e., combined cross-sectional imaging) as the reference standards.
Methods
Three men and seven women (age range 26–73 years) with anatomical and/or histologically proven disease were included in this study. Three patients had either metastatic head-and-neck paragangliomas (HNPGLs) or multifocal PGL, and seven patients had nonmetastatic disease. Comparative evaluation included morphological imaging with CT, functional imaging with 18F-DOPA PET, and 123I-MIBG imaging including SPECT/CT. Imaging results were analyzed on a per-patient and per-lesion basis.
Results
On a per-patient basis, 18F-DOPA PET’s detection rate for both nonmetastatic and metastatic/multifocal disease was 100%, whereas that of planar 123I-MIBG imaging alone was 10.0% and that of 123I-MIBG SPECT/CT was 20.0%. Overall, on a per-lesion basis, 18F-DOPA PET showed a sensitivity of 69.2% (McNemar p < 0.001) compared with anatomical imaging. Sensitivity of planar 123I-MIBG scintigraphy was 5.6%, and that of SPECT/CT was 11.1% (McNemar p < 0.0001). Overall, 18F-DOPA PET identified 18 lesions, and anatomical imaging identified 26 lesions; planar 123IMIBG imaging identified only 1 lesion, and SPECT/CT, 2 lesions.
Conclusion
18F-DOPA PET is more sensitive than is 123I-MIBG imaging, including SPECT/CT, for staging HNPGL. Combined functional and anatomical imaging (PET/CT) is indicated to exclude metastatic disease in extra-adrenal PGL.
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Acknowledgements
We thank Mathias Wochinz and Gerwig Eisenstein (Department of Nuclear Medicine, Medical University Innsbruck) for their work on this project, Dr. Cherise Guess (Department of Scientific Editing, St. Jude Children’s Research Hospital) for editorial assistance and Harald Kühschelm for statistical advice.
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All procedures performed in this study were in accordance with the ethical standards of the institutional and national research committee and with the principles of the 1964 declaration of Helsinki and its subsequent amendments. All patients published in this manuscript signed a written informed consent.
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Kroiss, A.S., Uprimny, C., Shulkin, B.L. et al. Compared to 123I-MIBG SPECT/CT, 18F-DOPA PET/CT provides accurate tumor extent in patients with extra-adrenal paraganglioma. Ann Nucl Med 31, 357–365 (2017). https://doi.org/10.1007/s12149-017-1162-7
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DOI: https://doi.org/10.1007/s12149-017-1162-7