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ObjectivesThis study aimed to evaluate the echo texture of the parotid salivary glands before and after radioiodine therapy (RIT) using ultrasound (US) images in patients with differentiated thyroid cancer and to evaluate the correlations between post‐RIT whole‐body scintigraphy (WBS) images and US image patterns in salivary and cervical areas.MethodsA retrospective study was performed with data on demographic and clinical information, US examinations, and WBS images collected through medical recordings.ResultsComparing the US features before and after RIT, significant echo texture heterogeneity was found in 31.3% of all patients evaluated. When evaluated according to the level of iodine 131 (I‐131) radioactivity (<5.6, 5.6–<9.3, and ≥9.3 GBq), echo texture heterogeneity was significantly associated with the 5.6‐GBq I‐131 radioactivity group (P < .001). No association was found for any level of I‐131 post‐RIT WBS uptake intensity and changes in US feature patterns.ConclusionsUltrasound may be a useful tool for evaluating chronic sialadenitis after RIT, and the I‐131 uptake intensity using a routine post‐RIT WBS is not associated with US echo texture changes.

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12064 Background: We previously showed that estimated glomerular filtration rate (eGFR) based on serum creatinine (Scr)(eGFRcr) using the 2009 CKD-EPI equation performed better than Cockroft-Gault equation (CG) in solid tumor patients in Brazil (Onco-GFR Study). In that study, eGFR based on Scr and cystatin C (Scys)(eGFRcr-cys) using the 2012 CKD-EPI was the most accurate equation and suitable for use as a confirmatory test. The CKD-EPI 2009 eGFRcr and 2012 eGFRcr-cys equations include a term for race (Black vs. non-Black). The 2021 CKD-EPI eGFRcr and eGFRcr-cys equations do not include race and are now recommended in the US, but have not been assessed in a multi-racial population or in cancer patients. The aim of this study is to evaluate the performance of the 2021 CKD-EPI equations in the Onco-GFR Study. Methods: Measured GFR (mGFR) was determined using the plasma clearance of 51Cr-EDTA. Scr and Scys assays were traceable to international standards. Results: A group of 1,200 patients recruited between April 2015 and September 2017 were included for analysis. Patients were 58.8±13.2 years, 50.8% male. Race distribution was Black participants 12.8% and non-Black participants 81.2%. Mean (SD) mGFR was 78.5±21.7 ml/min/1.73 m2. For eGFRcr, the overestimation of mGFR was larger for the 2021 vs. 2009 equation -10.0 vs. 8.1 ml/min/1.73m2, resulting in lesser accuracy 1-P30 of 22.3 vs. 19.1, but still more accurate than CG equation (1-P30 of 24.9, P = 0.05). For eGFRcr-cys, the overestimation of mGFR was larger for the 2021 vs. 2012 equation (-4.1 vs. -2.0 ml/min/1.73m2). eGFRcr-cys using the 2021 equation was more accurate than eGFRcr using the 2021 equation and eGFRcys using the 2012 equation (1-P30 9.8 vs. 22.3 and 12.3, p-values < 0.001 and 0.01, respectively) (Table). Conclusions: 2021 CKD-EPI eGFRcr equation race performed better than CG. 2021 CKD-EPI eGFRcr-cys performed better than 2021 eGFRcr and 2012 eGFRcys equations. Removing race from eGFR equations represents an advance and should be incorporated in cancer care. [Table: see text]

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INTRODUÇÃO: A doença de Graves (DG) é a causa mais comum de hipertireoidismo e, entre as abordagens terapêuticas mais utilizadas para o tratamento do hipertireoidismo por doença de Graves, encontram-se a cirurgia, o uso de drogas antitireoidianas e a radioiodoterapia. No cálculo dosimétrico para determinação da dose de radioiodo a ser utilizada, é possível empregar a ultrassonografia e a cintilografia para avaliar o volume tireoidiano. OBJETIVO: O presente estudo visa correlacionar essas metodologias com ênfase no volume obtido e nas implicações dosimétricas. SUJEITOS E MÉTODOS: Foram incluídos no estudo 103 pacientes com diagnóstico de DG encaminhados para radioiodoterapia. Esses foram submetidos à ultrassonografia da tireoide e à cintilografia tireoidiana, com cálculo de volume pela cintilografia baseado na fórmula de Allen. RESULTADOS E CONCLUSÕES: Observou-se boa correlação entre os dois métodos, porém com massa estimada pela cintilografia sistematicamente maior que a estimada pela ultrassonografia, o que pode acarretar em menor estimativa de dose absorvida quando utilizado o método cintilográfico.