Yuya Nogami1, Kouji Banno2, Haruko Irie1, Miho Iida1, Yohei Masugi3, Koji Murakami4, Daisuke Aoki1. 1. Department of Obstetrics and Gynecology, School of Medicine, Keio University, Tokyo, Japan. 2. Department of Obstetrics and Gynecology, School of Medicine, Keio University, Tokyo, Japan kbanno@z7.keio.jp. 3. Department of Pathology, School of Medicine, Keio University, Tokyo, Japan. 4. Department of Radiology, School of Medicine, Keio University, Tokyo, Japan.
Abstract
AIM: This study investigated whether dual-phase scanning (DPS) with 18-fludeoxyglucose positron emission tomography -computed tomography (FDG PET-CT) improves diagnosis of lymph node metastasis (LNM) in gynecologic malignancies, compared to mono-phase scanning (MPS). PATIENTS AND METHODS: The study included 139 patients who underwent PET-CT followed by systemic lymph node dissection. PET-CT scans were obtained twice. The maximum standardized uptake value (SUVmax) was measured and the retention index (RI) was calculated as the % change from the early to the delayed scan. The optimal threshold of RI was determined using a receiver operating characteristic (ROC) curve. Diagnostic efficacies were calculated for MPS and DPS using pathological results. RESULTS: In total, 1,879 regions were dissected. The optimal RI was 9%. The sensitivity, specificity and accuracy were 35.8%, 99.0% and 96.8% for MPS and 26.9%, 99.6% and 97.0% for DPS, respectively. Specificity was significantly improved by DPS and accuracy was also improved, but not significantly. CONCLUSION: DPS had an unsatisfactory impact on the diagnostic efficacy for LNM. Copyright
AIM: This study investigated whether dual-phase scanning (DPS) with 18-fludeoxyglucose positron emission tomography -computed tomography (FDG PET-CT) improves diagnosis of lymph node metastasis (LNM) in gynecologic malignancies, compared to mono-phase scanning (MPS). PATIENTS AND METHODS: The study included 139 patients who underwent PET-CT followed by systemic lymph node dissection. PET-CT scans were obtained twice. The maximum standardized uptake value (SUVmax) was measured and the retention index (RI) was calculated as the % change from the early to the delayed scan. The optimal threshold of RI was determined using a receiver operating characteristic (ROC) curve. Diagnostic efficacies were calculated for MPS and DPS using pathological results. RESULTS: In total, 1,879 regions were dissected. The optimal RI was 9%. The sensitivity, specificity and accuracy were 35.8%, 99.0% and 96.8% for MPS and 26.9%, 99.6% and 97.0% for DPS, respectively. Specificity was significantly improved by DPS and accuracy was also improved, but not significantly. CONCLUSION:DPS had an unsatisfactory impact on the diagnostic efficacy for LNM. Copyright
Authors: Matthias Weissinger; Stefan Kommoss; Johann Jacoby; Stephan Ursprung; Ferdinand Seith; Sascha Hoffmann; Konstantin Nikolaou; Sara Yvonne Brucker; Christian La Fougère; Helmut Dittmann Journal: J Clin Med Date: 2022-08-23 Impact factor: 4.964