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• W4238075878 abstract "Abstract Background: The identification of neck lymph node (LN) metastases represents a very important issue in the management of patients with differentiated thyroid carcinoma (DTC). To this purpose, in the present study, we used 131I-SPECT/CT as a diagnostic imaging procedure. Methods: A consecutive series of 224 DTC patients with ascertained neck radioiodine-avid foci at ¹³¹I-SPECT/CT during long-term follow-up was evaluated. All patients had already undergone total thyroidectomy and radioiodine therapy and had been classified as follows: 62 at high risk (H), 64 at low risk (L) and 98 at very low risk (VL). ¹³¹I-Whole body scan (WBS) followed by SPECT/CT was performed in all cases. Results: In the 224 patients, 449 neck iodine avid foci were ascertained at SPECT/CT, while 322 were evidenced at WBS in 165/224 patients. WBS classified as residues 263/322 foci and as unclear 59/322 foci; among the former foci SPECT/CT correctly characterized 8 LN metastases and 3 physiologic uptakes and among the latter, it pinpointed 26 LN metastases, 18 residues, and 15 physiologic uptakes. SPECT/CT also classified 127 foci occult at WBS as 59 LN metastases and 68 residues. Globally, SPECT/CT identified 93 LN metastases in 59 patients (26 H, 20 L, 13 VL), while WBS evidenced 34 in 25 cases. All 13 VL patients, T1aN0M0, 5 of whom with LN near sub-mandibular glands, had thyroglobulin undetectable or <2.5 ng/ml. Globally, SPECT/CT obtained an incremental value than WBS in 45.5 % of patients, a more correct patient classification changing therapeutic approach in 30.3 % of cases and identified WBS false-positive findings in 8% of cases. Conclusions: ¹³¹I-SPECT/CT proved to correctly detect and characterize neck LN metastases in DTC patients in long-term follow-up, improving the performance of planar WBS. SPECT/CT routine use is thus suggested; its role is particularly relevant in patients with WBS inconclusive, VL, T1aN0M0 and with undetectable or very low thyroglobulin levels. Keywords: Differentiated thyroid carcinoma (DTC), Neck lymph node metastases, Long-term follow-up, 131I-Whole body scan (WBS), 131I-SPECT/CT" @default.
• W4238075878 created "2022-05-12" @default.
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• W4238075878 date "2020-03-18" @default.
• W4238075878 modified "2023-09-26" @default.
• W4238075878 title "Neck Lymph Node Metastasis Detection in Patients with Differentiated Thyroid Carcinoma (DTC) in Long-Term Follow-up: a ¹³¹I-SPECT/CT Study" @default.
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• W4238075878 doi "https://doi.org/10.21203/rs.2.17530/v3" @default.
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