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Application value of high resolution magnetic resonance imaging and positron emission tomography and computed tomography in the detection of peripheral metastatic small lymph nodes and preoperative T staging in rectal cancer |
QIN Xiaoxue ZHANG Wen GAO Hong HU Yuxia▲ |
Department of Imaging, Qinhuai Medical District of the Chinese People’s Liberation Army Eastern Theater General Hospital, Jiangsu Province, Nanjing 210000, China
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Abstract Objective To investigate the application value of high resolution magnetic resonance imaging (MRI) and positron emission tomography and computed tomography (PET/CT) in the detection of peripheral metastatic small lymph nodes and preoperative T staging in rectal cancer. Methods The clinical data of 109 patients with rectal cancer admitted to Qinhuai Medical District of the Chinese People’s Liberation Army Eastern Theater General Hospital from August 2019 to December 2021 were retrospectively analyzed. Taking the pathological results as the gold standard, the value of different methods (high resolution MRI and PET/CT examination) in screening peripheral metastatic small lymph nodes and preoperative T staging were analyzed. Results Pathological diagnosis showed that 352 peripheral metastatic small lymph nodes were found in 109 patients with rectal cancer, including 26 cases in T1-T2 staging, 68 cases in T3 stage, and 15 cases in T4 staging. High-resolution MRI was consistent with the gold standard in the diagnosis of peripheral metastatic small lymph nodes and preoperative T1-T2, T3 staging (Kappa=0.565, 0.705, 0.750, P<0.05), there was no consistency in the diagnosis of preoperative T4 staging (P>0.05). PET/CT was consistent with the gold standard in the diagnosis of peripheral metastatic small lymph nodes and preoperative T1-T2, T3 staging (Kappa=0.696, 0.590, 0.455, P<0.05), there was no consistency in the diagnosis of preoperative T4 staging (P>0.05). The combination of the two methods had strong consistency with the gold standard in the diagnosis of peripheral metastatic small lymph nodes and preoperative T1-T2, T3, T4 stage (Kappa=0.838, 0.808, 0.865, 0.709, P<0.05). The sensitivity and specificity of high-resolution MRI combined with PET/CT in the screening of small peripheral metastatic lymph nodes and preoperative T staging were higher than 90%. Conclusion High-resolution MRI combined with PET/CT has a high detection rate of peripheral metastatic small lymph nodes around rectal cancer, and the combined examination has a high diagnostic value in preoperative T staging.
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