Journals / Molecular Imaging and Radionuclide Therapy / 2022 / Cilt: 31 - Sayı: 2

Prevalence and Clinical Significance of Incidental Focal 18 F-FDG Uptake in Colon on PET/CT Imaging

PET/BT Görüntülemede Kolonda İnsidental Fokal 18F-FDG Tutulumunun Prevalansı ve Klinik Önemi

Pages
96–103
Publication Date
2022-09-03
DOI
—
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Conclusion: In conclusion, any unexpected focal 18F-FDG uptake in 18F-FDG PET/CT studies is suspicious for malignancy and should be clarified by colonoscopy.

📌 3 Key Takeaways

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Objective & Hypothesis:Objectives: The present study aimed to identify the prevalence of focal uptake in the colon on18fluorine-fluorodeoxyglucose (18F-FDG) positron emission tomography/computed tomography (PET/CT) studies performed for the evaluation of malignancies other than colon, to detect the rate of malignancy in incidental focal 18F-FDG avid colonic lesions and to investigate if any possible role of maximum standardized uptake value (SUVmax ) values in the discrimination of malignant lesions from premalignant and benign ones exist.
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Key Findings & Data:Methods: We retrospectively reviewed the files of 8,017 patients with known or suspected malignancy, who underwent whole-body18F-FDG PET/CT at our institution during the period November 2017 to November 2019.
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Conclusion & Impact:Conclusion: In conclusion, any unexpected focal 18F-FDG uptake in 18F-FDG PET/CT studies is suspicious for malignancy and should be clarified by colonoscopy.
🔬Design:Review & Systematic Survey
📍Scope:2017 Verileri
⚙️Variables:Domain Parameters

Abstract

Objectives: The present study aimed to identify the prevalence of focal uptake in the colon on18fluorine-fluorodeoxyglucose (18F-FDG) positron emission tomography/computed tomography (PET/CT) studies performed for the evaluation of malignancies other than colon, to detect the rate of malignancy in incidental focal 18F-FDG avid colonic lesions and to investigate if any possible role of maximum standardized uptake value (SUVmax ) values in the discrimination of malignant lesions from premalignant and benign ones exist. Methods: We retrospectively reviewed the files of 8,017 patients with known or suspected malignancy, who underwent whole-body18F-FDG PET/CT at our institution during the period November 2017 to November 2019. Patients showing a single site of focally increased colonic18F-FDG uptake that was more intense compared to liver uptake on18F-FDG PET studies and referred to colonoscopy were enrolled in the study. Results: Fifty two patients (83.8%) had at least 1 corresponding lesion on colonoscopy, whereas in 10 patients no lesion was detected. Subsequent histopathological examinations revealed no corresponding lesion in 13 (13.7%), a benign lesion in 18 (18.9%), hyperplastic polyp in 10 (10.5%), low-grade polyp in 16 (16.8%), high-grade polyp in 29 (30.5%) and malignant lesion in 9 (9.5%) of the focal18F-FDG uptake sites. According to histopathology results, statistically no significant difference was found between the SUVmax measurements of malignant and benign cases (p>0.05) but the average SUVmax measurements of malignant cases were found to be significantly higher than lower + high-grade cases (p<0.05) and hyperplastic polyp cases (p<0.01). Conclusion: In conclusion, any unexpected focal 18F-FDG uptake in 18F-FDG PET/CT studies is suspicious for malignancy and should be clarified by colonoscopy. The intensity of 18F-FDG uptake does not preclude the application of colonoscopy and histopathological verification of the lesion if there is any

Özet

Amaç: Bu çalışmanın amaçları kolon dışındaki malignitelerin değerlendirilmesi için yapılan 18flor-florodeoksiglukoz (18F-FDG) pozitron emisyon tomografisi/bilgisayarlı tomografi (PET/BT) çalışmalarında kolonda fokal tutulum prevalansını, tesadüfi fokal 18F-FDG avid kolonik lezyonlarda malignite oranını belirlemek ve maksimum standardize alım değeri (SUVmaks ) değerlerinin, malign lezyonların premalign ve iyi huylu olanlardan ayırt edilmesindeki olası rolünü araştırmaktı. Yöntem: Kasım 2017-Kasım 2019 döneminde kurumumuzda tüm vücut 18F-FDG PET/BT uygulanan, malignitesi bilinen veya şüphelenilen 8.017 hastanın dosyalarını geriye dönük olarak inceledik. 18F-FDG PET çalışmalarında kolonda, karaciğer tutulumuna göre daha yoğun tek bir fokal 18F-FDG tutulumu gösteren ve kolonoskopiye yönlendirilen hastalar olan çalışmaya alındı.Bulgular: Elli iki hastada (%83,8) kolonoskopide buna karşılık gelen en az 1 lezyon bulunurken, 10 hastada lezyon saptanmadı. Sonraki histopatolojik incelemelerde fokal 18F-FDG tutulum bölgelerinin 13’ünde (%13,7) karşılık gelen lezyon izlenmedi, 18’inde (%18,9) benign lezyon, 10’unda hiperplastik polip (%10,5), 16’sında düşük dereceli polip (%16,8), 29’unda (%30,5) yüksek dereceli polip, 9’unda (%9,5) malign lezyon saptandı. Histopatoloji sonuçlarına göre malign ve benign olguların SUVmaks ölçümleri arasında istatistiksel olarak anlamlı fark bulunmazken (p>0,05), malign olguların ortalama SUVmaks ölçümleri düşük + yüksek gradlı olgulara (p<0,05) ve hiperplastik polip olgularına (p<0,01) göre anlamlı derecede yüksek bulundu. Sonuç: Sonuç olarak, 18F-FDG PET/BT çalışmalarında herhangi bir beklenmeyen fokal18F-FDG tutulumu malignite açısından şüphelidir ve kolonoskopi ile netleştirilmelidir. 18F-FDG tutulumunun yoğunluğu kolonoskopi yapılmasını ve varsa lezyonun histopatolojik olarak doğrulanmasını engellemez.

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Cite This Article

Özülker, T., Gökden, Y., Özülker, F. (2022). Prevalence and Clinical Significance of Incidental Focal 18 F-FDG Uptake in Colon on PET/CT Imaging. Molecular Imaging and Radionuclide Therapy, Cilt: 31 - Sayı: 2, 96–103. https://ajindex.com/articles/425697

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