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  • Title: The Value of Preoperative Positron Emission Tomography/Computed Tomography in Node-Negative Endometrial Cancer on Magnetic Resonance Imaging.
    Author: Park JY, Lee JJ, Choi HJ, Song IH, Sung CO, Kim HO, Chae SY, Kim YT, Nam JH.
    Journal: Ann Surg Oncol; 2017 Aug; 24(8):2303-2310. PubMed ID: 28550488.
    Abstract:
    OBJECTIVE: The aim of this study was to investigate the value of [18F]fluorodeoxyglucose-positron emission tomography/computed tomography (FDG-PET/CT) in predicting lymph node status in node-negative endometrial cancer on preoperative magnetic resonance imaging (MRI). METHODS: Patients with endometrial cancer who underwent both preoperative MRI and FDG-PET/CT followed by hysterectomy and lymphadenectomy were initially included. We then enrolled patients with MRI-defined node-negative disease (lymph nodes <1 cm in the short-axis diameter, or no visible lymph node). Histologic examination was the gold standard for lymph node metastasis diagnosis. The diagnostic performance of FDG-PET/CT in predicting lymph node metastasis was calculated in patient-by-patient and lymph node station-by-station analyses. RESULTS: On preoperative MRI, 362 patients had no lymph node metastasis. All patients underwent pelvic lymph node dissection and 118 patients underwent further para-aortic lymph node dissection. From 2099 lymph node stations, 10,238 lymph nodes were retrieved. Twenty-seven patients (7.5%) had lymph node metastasis in 49 lymph node stations (2.3%) on pathologic examination. FDG-PET/CT identified lymph node metastasis in five patients (18.5%) and eight lymph node stations (16.3%). The median diameter of false-negative metastatic lymph nodes was 6 mm (range 1-22) in the long axis and 3 mm (range 1-11) in the short axis. For para-aortic lymph nodes, FDG-PET/CT diagnosed 2 of 11 patients (18.1%) with para-aortic lymph node metastasis, and 3 of 12 para-aortic lymph node stations (25%) with metastasis. CONCLUSION: Preoperative FDG-PET/CT has low value in predicting lymph node metastasis in node-negative endometrial cancer on preoperative MRI.
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