Abstract
Purpose
The purpose of the present study was to evaluate the diagnostic accuracy of 68Ga-DOTANOC positron emission tomography (PET)/CT in patients with suspicion of pheochromocytoma.
Methods
Data of 62 patients [age 34.3 ± 16.1 years, 14 with multiple endocrine neoplasia type 2 (MEN2)] with clinical/biochemical suspicion of pheochromocytoma and suspicious adrenal lesion on contrast CT (n = 70), who had undergone 68Ga-DOTANOC PET/CT, were retrospectively analyzed. PET/CT images were analyzed visually as well as semiquantitatively, with measurement of maximum standardized uptake value (SUVmax), SUVmean, SUVmax/SUVliver, and SUVmean/SUVliver. Results of PET/CT were compared with 131I-metaiodobenzylguanidine (MIBG) imaging, which was available in 40 patients (45 lesions). Histopathology and/or imaging/clinical/biochemical follow-up (minimum 6 months) was used as reference standard.
Results
The sensitivity, specificity, and accuracy of 68Ga-DOTANOC PET/CT was 90.4, 85, and 88.7 %, respectively, on patient-based analysis and 92, 85, and 90 %, respectively, on lesion-based analysis. 68Ga-DOTANOC PET/CT showed 100 % accuracy in patients with MEN2 syndrome and malignant pheochromocytoma. On direct comparison, lesion-based accuracy of 68Ga-DOTANOC PET/CT for pheochromocytoma was significantly higher than 131I-MIBG imaging (91.1 vs 66.6 %, p = 0.035). SUVmax was higher for pheochromocytomas than other adrenal lesions (p = 0.005), MEN2-associated vs sporadic pheochromocytoma (p = 0.012), but no difference was seen between benign vs malignant pheochromocytoma (p = 0.269).
Conclusion
68Ga-DOTANOC PET/CT shows high diagnostic accuracy in patients with suspicion of pheochromocytoma and is superior to 131I-MIBG imaging for this purpose. Best results of 68Ga-DOTANOC PET/CT are seen in patients with MEN2-associated and malignant pheochromocytoma.
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Sharma, P., Dhull, V.S., Arora, S. et al. Diagnostic accuracy of 68Ga-DOTANOC PET/CT imaging in pheochromocytoma. Eur J Nucl Med Mol Imaging 41, 494–504 (2014). https://doi.org/10.1007/s00259-013-2598-1
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DOI: https://doi.org/10.1007/s00259-013-2598-1