直肠黏液腺癌的MRI特征分析

发布时间：2018-04-05 15:06

本文选题：直肠　切入点：黏液腺癌　出处：《临床放射学杂志》2017年02期

【摘要】：目的探讨直肠黏液腺癌(MA)的MRI特征。方法回顾性分析经病理证实的15例直肠MA的临床资料和MRI表现,15例均行MRI平扫,其中9例行动态增强扫描,分析其影像特征。结果 15例直肠MA表现为肠壁增厚型12例(病变长度平均10.2 cm,厚度平均2.5 cm),其中10例在DWI及ADC图上具有较T_2WI分辨更清晰的同心圆或夹心饼样分层信号;肿块型3例(病变厚度平均3.4 cm)。肿瘤T_1WI呈等或稍低信号;T_2WI以高信号为主,其内可见斑片状等信号或低信号间隔;DWI呈等或高信号,或不均匀稍高和明显高亮信号;ADC图以高信号为主,高信号区平均ADC值2.09×10~(-3)mm~2/s;增强扫描肿瘤黏液部分呈不均匀延迟强化,黏膜下层强化弱呈中间空表现,实性腺癌部分呈较均匀持续明显强化。结论直肠黏液腺癌的节段长、肠壁厚及中间空MRI特征对其诊断及鉴别诊断有重要价值。
[Abstract]:Objective to investigate the MRI features of rectal mucinous adenocarcinoma (MAA).Methods the clinical data and MRI findings of 15 cases of rectal MA confirmed by pathology were retrospectively analyzed. MRI plain scan was performed in 15 cases, among which 9 cases underwent dynamic contrast enhanced scanning and their imaging features were analyzed.Results in 15 cases, rectal wall thickening was seen in 12 cases (mean lesion length was 10.2 cm and thickness was 2.5 cm). In 10 cases, concentric or sandwich slice signals were more clearly identified on DWI and ADC images than those on T_2WI.There were 3 cases of mass type (mean thickness 3.4 cm).In the T_1WI of the tumor, the main signal intensity was high signal intensity, such as high signal intensity, or low signal intensity interval signal intensity or isointense signal, or non-uniform and obvious high intensity signal intensity. The main signal intensity was high signal intensity, and the main signal intensity was high signal intensity in the T_1WI of the tumor on the same or slightly low signal intensity / T _ 2WI.The mean ADC value of the hyperintense region was 2.09 脳 10 ~ (-3) mm ~ (-1) / s. The enhancement of the mucous part of the tumor showed inhomogeneous delayed enhancement, the submucosal enhancement was weak in the middle space, and the enhancement of the solid adenocarcinoma was more homogeneous and sustained.Conclusion the MRI features of rectal mucinous adenocarcinoma, including length of segment, thickness of intestinal wall and middle space, are of great value in the diagnosis and differential diagnosis of rectal mucinous adenocarcinoma.
【作者单位】：南昌大学第二附属医院MRI室;
【分类号】：R445.2;R735.37

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