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  • Author: Federica Brozzi x
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Laura Agate Endocrinology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy

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Francesca Bianchi Unit of Endocrine and Oncological Nuclear Medicine Therapy, Diagnostic and Imaging Department, University of Pisa, Pisa, Italy

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Federica Brozzi Unit of Endocrine and Oncological Nuclear Medicine Therapy, Diagnostic and Imaging Department, University of Pisa, Pisa, Italy

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Pierina Santini Unit of Endocrine and Oncological Nuclear Medicine Therapy, Diagnostic and Imaging Department, University of Pisa, Pisa, Italy

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Eleonora Molinaro Endocrinology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy

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Valeria Bottici Endocrinology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy

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David Viola Endocrinology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy

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Loredana Lorusso Endocrinology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy

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Paolo Vitti Endocrinology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy

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Rossella Elisei Endocrinology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy

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Background: Recently, there has been a trend to reduce the use of radioiodine remnant ablation (RRA) in patients with low-risk (LR) and intermediate-risk (IR) differentiated thyroid cancer (DTC). Objectives: The aim of this paper was to evaluate the diagnostic role of whole-body scan (ptWBS) performed after RRA in LR and IR DTC patients. Methods: We analyzed 545 DTC patients treated with total thyroidectomy and RRA in hypothyroidism followed by a ptWBS. Neck ultrasound (US) and serum thyroglobulin measurement were performed. According to the American Thyroid Association guidelines, patients were classified as LR (n = 345) and IR (n = 200). Results: In addition to the thyroid remnant, the ptWBS showed the presence of further areas of <sup>131</sup>I uptake in 16/545 (2.9%) cases. ptWBS showed laterocervical lymph node metastases in 11/16 patients (10/11 were also detected by US), mediastinal uptake in 1/16, lung metastases in 3/16, and bone metastases in 1/16. Only 6/545 (1.1%) metastases were detected by ptWBS alone. After 7.8 years, 8/16 patients were free of disease, and 8 had persistent disease: 4 “biochemical” and 4 “structural.” Remission was achieved in 3 cases after one single <sup>131</sup>I course, in 1 case after surgery, and in the last 4 cases after several <sup>131</sup>I courses. Conclusions: The ptWBS diagnostic role was clinically relevant for the therapeutic strategies of our patients only in 1.1% of the cases. The cost-effectiveness of performing RRA and ptWBS in all LR and IR patients to find 1–2% of the cases with distant metastases remains controversial.

Article Type:
Research Article
DOI:
https://doi.org/10.1159/000494290
Volume/Issue:
Volume 8: Issue 2
Free access