Journals / Molecular Imaging and Radionuclide Therapy / 2021 / Cilt: 30 - Sayı: 2

The Role of Metabolic Volumetric Parameters in Predicting Malignancy in Incidental Thyroid Nodules Detected in 18F-FDG PET/CT Scans

18F-FDG PET/BT Taramalarında Tespit Edilen Tesadüfi Tiroid Nodüllerinde Maligniteyi Öngörmede Metabolik Volumetrik Parametrelerin Rolü

Pages
86–92
Publication Date
2022-10-18
DOI
—
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

We believe that unnecessary thyroid FNABs can be avoided for thyroid incidental nodules if such relation and cut-off values are determined and that it will be useful in hastening the operation of the necessary patients.

📌 3 Key Takeaways

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Objective & Hypothesis:Objectives: The metabolic activities of tumors can be calculated volumetrically during positron emission tomography/computed tomography (PET/CT) imaging using metabolic tumor volume (MTV) and total lesion glycolysis (TLG).
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Key Findings & Data:Results: TLG levels were significantly higher in malignant or malignant-suspicious nodules than in benign nodules (p=0.013).
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Conclusion & Impact:We believe that unnecessary thyroid FNABs can be avoided for thyroid incidental nodules if such relation and cut-off values are determined and that it will be useful in hastening the operation of the necessary patients.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

Objectives: The metabolic activities of tumors can be calculated volumetrically during positron emission tomography/computed tomography (PET/CT) imaging using metabolic tumor volume (MTV) and total lesion glycolysis (TLG). This study aimed to evaluate the roles of MTV and TLG in predicting the malignancy risk of incidental thyroid nodules detected by PET/CT imaging. Methods: Active metabolic areas of each section were manually drawn by region of interest to calculate the MTV of nodules, and all obtained values were then summed. TLG, the product of mean standardized uptake value and MTV, was calculated by multiplying two values. All participants underwent thyroid ultrasonography imaging. All nodules were divided into risk classes according to the European Thyroid Image Reporting and Data System (EU-TIRADS) that was developed by the European Thyroid Association. The American Thyroid Association Guidelines were used to determine which thyroid nodules would undergo thyroid fine-needle biopsy (FNAB). Results were classified according to the Bethesda scoring system. Results: TLG levels were significantly higher in malignant or malignant-suspicious nodules than in benign nodules (p=0.013). Although MTV levels were high in malignant or malignant-suspicious nodules than in benign and non-diagnostic nodules, it was statistically insignificant at limit values (p=0.079). Areas under curve (AUC) were 0.726 (p=0.005) and AUC: 0.668 (p=0.039) for TLG and MTV, respectively. The 2.3 g cut-off value of TLG has a sensitivity of 85.7% and specificity of 59.0%. The 1.7 mL cut-off value of MTV has a sensitivity of 78.6% and specificity of 60.4%. Conclusion: We believe that TLG evaluation will be useful in predicting high-risk malignancy or malignancy suspicion based on EU-TIRADS risk classification of incidental thyroid nodules detected in PET/CT images. We believe that unnecessary thyroid FNABs can be avoided for thyroid incidental nodules if such relation and cut-off values are determined and that it will be useful in hastening the operation of the necessary patients.

Özet

Amaç: Tümörlerin metabolik aktivitesi pozitron emisyon tomografi/bilgisayarlı tomografinin (PET/BT) görüntüleme sırasında hacimsel olarak hesaplanabilir. Bunlar metabolik tümör hacmi (MTV) ve toplam lezyon glikolizidir (TLG). Bu çalışmanın amacı, PET/BT görüntüleme ile saptanan tesadüfi tiroid nodüllerinde malignite riskini tahmin etmede hacimsel olarak metabolik aktivite gösteren MTV ve TLG’nin rollerini değerlendirmektir. Yöntem: Nodülün MTV’sini hesaplamak için, her bölümün aktif metabolik aktif lezyonlara ilgi alanları ile manuel olarak çizildi; daha sonra elde edilen tüm değerler toplandı. Ortalama standardize uptake değeri ve MTV’nin ürünü olan TLG, iki değer çarpılarak hesaplandı. Tüm katılımcıların tiroid ultrasonografileri yapıldı. Tüm nodüller, Avrupa Tiroid Birliği (ETA) tarafından geliştirilen “EU-TIRAD”a göre risk sınıflarına ayrıldı. ATA Kılavuzu’na göre hangi tiroid nodüllerinin tiroid İİAB geçireceğine karar verildi. Sonuçlar Bethesda puanlama sistemine göre verildi Bulgular: TLG düzeyleri, benign nodüllere göre malign veya malign-şüpheli nodüllerde anlamlı olarak yüksekti (p=0,013). MTV düzeyleri malign veya malign-şüpheli nodüllerde benign ve tanısal olmayan nodüllere göre yüksek olmasına rağmen sınır değerlerde istatistiksel olarak anlamlı değildi (p=0,079). Eğri altındaki alan (AUC) TLG için 0,726 (p=0,005) olarak hesaplandı. TLG için 2,3 g kesme değeri için duyarlılık %85,7 ve özgüllük %59,0 olarak bulundu. MTV için AUC 0,668 olarak hesaplandı (p=0,039). MTV için 1,7 mL cut-off için duyarlılık %78,6, özgüllük ise %60,4 idi. Sonuç: PET/BT ile saptanan tesadüfi tiroid nodüllerinde, yüksek riskli malignite veya malignite şüphesine sahip olma açısından TLG değerlendirmesinin, EU-TIRADS’ye göre yüksek ve çok yüksek riskinin tahmin edilmesinde faydalı olacağına inanıyoruz. Böyle bir ilişki ve kesim değerlerinin kesin olarak tespit edilmesi durumunda, tiroid tesadüfi nodüller için gereksiz tiroid İİAB’lerinden kaçınılabileceğini ve gerekli hastaların ameliyatının geciktirilmemesi açısından faydalı olacağını düşünüyoruz.

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Cite This Article

Çiriş, M., Erdoğan, M., Şengül, S. S., Yıldız, M., Avcı, M., Korkmaz, H., Tarsus, B., Boylubay, Ş. M. (2022). The Role of Metabolic Volumetric Parameters in Predicting Malignancy in Incidental Thyroid Nodules Detected in 18F-FDG PET/CT Scans. Molecular Imaging and Radionuclide Therapy, Cilt: 30 - Sayı: 2, 86–92. https://ajindex.com/articles/581533

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