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目的:评价磁共振在胃癌术前TN分期中的价值。方法:26例经胃镜活检确诊的患者术前行磁共振成像,MR动态增强图像、DWI图像对胃癌术前TN分期评估,并与术后病理结果对照。结果:MR对胃癌T分期诊断的准确率为76.9%。MR对胃周转移淋巴结的检出率为41.8%,胃癌病变的表面扩散系数(ADC)值较相应正常胃壁的ADC值偏低(P=0.145)。胃癌病变ADC值与浆膜浸润差异有统计学意义(P=0.036<0.05)。结论:MRI能对胃癌术前TN分期做出准确的判断。DWI对于胃癌病灶以及其淋巴结转移的判断具有较高的影像诊断学价值
Objective: To evaluate the value of magnetic resonance in preoperative TN staging of gastric cancer. Methods: Twenty-six patients diagnosed by gastroscopic biopsy performed preoperative MRI, MR dynamic enhanced images and DWI images for preoperative TN staging of gastric cancer, and compared with pathological results. Results: The accuracy of MR in diagnosing T-staging of gastric cancer was 76.9%. The detection rate of MR on gastric lymph node metastasis was 41.8%. The ADC value of gastric lesions was lower than that of corresponding normal gastric wall (P = 0.145). The difference between ADC value and serosal invasion in gastric cancer was statistically significant (P = 0.036 <0.05). Conclusion: MRI can make accurate judgment on preoperative TN staging of gastric cancer. DWI for the diagnosis of gastric lesions and lymph node metastasis with high diagnostic value of the image