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目的探讨MRI在血管前置诊断中的价值。方法对临床病理证实的7例血管前置的MRI表现进行回顾性分析,其中2例为双胎妊娠。图像分析以SSFSE T_2WI和抑脂FSE T_2WI序列轴位和矢状位为主,重点观察宫颈内口上方及其周围的异常脐血管结构及其走行,并注意胎盘位置及变异情况。结果 7例MRI检查均于胎先露与宫颈内口间见一根或数根异常走行的脐血管。7例均存在胎盘低置或前置,以及帆状胎盘、球拍状胎盘或副胎盘变异。其中,合并血管前置的胎盘变异有帆状胎盘4例,球拍状胎盘1例,副胎盘2例。双胎妊娠均为帆状胎盘血管前置。结论 MRI在血管前置的产前诊断上发挥着重要的作用,尤其是在临床怀疑而超声诊断不明,或当超声提示帆状胎盘、多胎妊娠、胎盘低置时,应常规行MRI检查以除外血管前置。
Objective To investigate the value of MRI in the diagnosis of vascular anterior. Methods The clinical manifestations of 7 cases of prevascular angiography were retrospectively analyzed, of which 2 were twin pregnancies. The image analysis mainly focused on the axial and sagittal positions of SSFSE T_2WI and FSE T_2WI, and focused on the abnormal umbilical vascular structures and their movements above and around the mouth of the cervix, and paid attention to the location and variation of the placenta. Results Seven cases of MRI examination revealed one or more abnormal umbilical vessels in the fetal forefront and cervix. All 7 cases had low placenta or anterior placenta, as well as variation of sail placenta, racket placenta or paracentesis. Among them, there were 4 placenta-like placenta variations, 1 racket-like placenta, and 2 para-placenta. Twin pregnancies were all sails of placenta previa. Conclusions MRI plays an important role in the prenatal diagnosis of preeclampsia, especially when the diagnosis is unclear in clinical suspicion, or when the sonography shows the placenta accreta, multiple pregnancies and placenta accreta. Vascular advance.