Abstract
Purpose
Specific recommendations on screening modalities for paraganglioma (PGL) and phaeochromocytoma (PCC) in asymptomatic SDHx mutation carriers (relatives) are still lacking. We evaluated the added value of 18F-FDG PET/CT in comparison with morphological imaging at initial diagnosis and 1 year of follow-up in this population.
Methods
The study included 30 consecutive relatives with a proven SDHx mutation who were investigated by 18F-FDG PET/CT, gadolinium-enhanced magnetic resonance angiography of the head and neck, thoracic/abdominal/pelvic (TAP) contrast-enhanced CT and/or TAP MRI. 123I-MIBG scintigraphy was performed in 20 subjects and somatostatin receptor scintigraphy (SRS) in 20 subjects. The gold standard was based on pathology or a composite endpoint as defined by any other positive imaging method and persistent tumour on follow-up. Images were considered as false-positive when the lesions were not detected by another imaging method or not confirmed at 1 year.
Results
At initial work-up, an imaging abnormality was found in eight subjects (27 %). The final diagnosis was true-positive in five subjects (two with abdominal PGL, one with PCC and two with neck PGL) and false-positives in the other three subjects (detected with 18F-FDG PET/CT in two and TAP MRI in one). At 1 year, an imaging abnormality was found in three subjects of which one was an 8-mm carotid body PGL in a patient with SDHD mutaion and two were considered false-positive. The tumour detection rate was 100 % for 18F-FDG PET/CT and conventional imaging, 80 % for SRS and 60 % for 123I-MIBG scintigraphy. Overall, disease was detected in 4 % of the subjects at the 1-year follow-up.
Conclusion
18F-FDG PET/CT demonstrated excellent sensitivity but intermediate specificity justifying combined modality imaging in these patients. Given the slow progression of the disease, if 18F-FDG PET/CT and MRI are normal at baseline, the second imaging work-up should be delayed and an examination that does not expose the patient to radiation should be used.
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Acknowledgments
Seventeen patients were previously enrolled in the PGL.EVA study supported by Program Hospitalier National de Recherche Clinique 2004 (PCR05007).
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Lepoutre-Lussey, C., Caramella, C., Bidault, F. et al. Screening in asymptomatic SDHx mutation carriers: added value of 18F-FDG PET/CT at initial diagnosis and 1-year follow-up. Eur J Nucl Med Mol Imaging 42, 868–876 (2015). https://doi.org/10.1007/s00259-015-3003-z
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DOI: https://doi.org/10.1007/s00259-015-3003-z