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前置胎盘和胎盘前置状态的MRI诊断价值-Value of MRI in the diagnosis of placenta previa

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本研究纳入25例前置胎盘和胎盘前置状态孕妇(孕龄21~38周),以病理或分娩时临床诊断为金标准,对比MRI与超声的诊断价值。MRI诊断前置胎盘伴发胎盘植入的敏感度71.4%、特异度72.7%,超声敏感度66.7%、特异度69.2%。MRI和超声对前置胎盘及伴发胎盘植入均有重要价值,两者可相互补充。

要点

  • MRI诊断前置胎盘伴发胎盘植入敏感度71.4%、特异度72.7%,阳性预测值76.9%、阴性预测值66.7%
  • 胎盘植入MRI表现包括子宫底蜕膜信号缺失、子宫肌层局部变薄、胎盘与子宫交界面结节样改变、T2WI胎盘内低信号带
  • MRI与超声对前置胎盘的诊断及分型差异无统计学意义,两者可相互补充

核心结论

  • MRI和超声对前置胎盘或前置状态伴发胎盘植入均有重要诊断价值,两者可相互补充。
  • MRI诊断前置胎盘伴发胎盘植入的敏感度71.4%、特异度72.7%,与超声(敏感度66.7%、特异度69.2%)相当。

研究设计与样本

  • 单中心回顾性研究,纳入25例前置胎盘和胎盘前置状态孕妇,年龄21~43岁(平均29.4±6.2岁)。
  • 孕龄21~38周(平均32.9±4.0周),25例均行产前MRI及超声检查。
  • 以病理或分娩时临床诊断为金标准,对比分析MRI与超声的诊断价值。
  • 25例中中央性19例、部分性3例、边缘性3例,MRI与超声分别正确诊断20例、18例。

关键影像表现/征象

  • 胎盘植入的MRI表现:子宫底蜕膜信号缺失,子宫肌层局部变薄。
  • 胎盘与子宫交界面可见结节样改变,胎盘信号不均匀。
  • T2WI上胎盘内可见低信号带,胎盘与膀胱之间组织间隙减小或消失。

诊断标准与关键数值

  • MRI诊断前置胎盘伴发胎盘植入:敏感度71.4%,特异度72.7%,阳性预测值76.9%,阴性预测值66.7%。
  • 超声诊断前置胎盘伴发胎盘植入:敏感度66.7%,特异度69.2%,阳性预测值66.7%,阴性预测值69.2%。
  • MRI与超声对前置胎盘的诊断及分型差异无统计学意义(P>0.05)。

临床应用与阅片要点

  • MRI可作为超声的补充检查,用于评估前置胎盘是否伴发胎盘植入,指导产前决策。
  • 重点观察T2WI上胎盘内低信号带、子宫肌层厚度、胎盘与子宫交界面形态及胎盘与膀胱间隙。
  • 对于前置胎盘孕妇,建议MRI和超声联合评估以提高胎盘植入的检出率。

局限性

  • 单中心研究,样本量较小(25例),需要更大样本多中心研究验证。
  • 回顾性研究设计,可能存在选择偏倚。

原文图文

【摘要】目的:探讨MRI对前置胎盘和胎盘前置状态及伴发的胎盘植入的诊断价值。方法:搜集本院25例前置胎盘和胎盘前置状态孕妇的临床及影像学资料,年龄21~43岁,平均(29.4±6.2)岁,孕龄21~38周,平均(32.9±4.0)周,25例均行产前MRI及超声(US)检查,以病理或分娩时临床诊断为金标准,对比分析两种检查的诊断价值。结果:25例前置胎盘和胎盘前置状态孕妇中,中央性19例,部分性3例,边缘性3例,MRI与US分别正确诊断20例、18例,两者对前置胎盘的诊断及分型差异无统计学意义(P>0.05)。MRI诊断前置胎盘伴发胎盘植入敏感度71.4%,特异度72.7%,阳性预测值76.9%,阴性预测值66.7%;US诊断伴发胎盘植入敏感度66.7%,特异度69.2%,阳性预测值66.7%,阴性预测值69.2%。胎盘植入的MRI表现主要有子宫底蜕膜信号缺失,子宫肌层局部变薄,胎盘与子宫交界面可见结节样改变,胎盘信号不均匀,在T2WI上胎盘内可见低信号带,胎盘与膀胱之间组织间隙减小或消失等。结论:MRI和US对前置胎盘或前置状态伴发胎盘植入有重要价值,两者可相互补充。;【Abstract】Objective:To assess the value of MRI in the diagnosis of placenta previa as well as accompanying placenta accreta.Methods:The clinical and imaging materials of 25 pregnant patients with placenta previa were included in this study,the age ranged from 21~43y (mean,29.4±6.2y),the gestational age of the fetuses at the time of MRI ranged from 21~38w (mean,32.9±4.0w).All patients underwent MR and ultrasonography (US) before delivery.Taking pathology and the final clinical diagnosis during delivery as gold standard,the value of these two imaging modalities were compared and analyzed.Results:Among the 25 pregnant women with placenta previa,there were central complete type (19 cases),partial type (3 cases) and marginal type (3 cases).MRI and US correctly diagnosed 20 cases and 18 cases respectively,with no significant statistic difference (P>0.05).The sensitivity and specificity of MRI and US for accompanying placenta accreta was 71.4%,66.7% and 72.7%,69.2%,respectively;the negative predictive value (NPV) and positive predictive value (PPV) was 76.9%,66.7% and 66.7%,69.2%,respectively.On MRI,the placenta accreta demonstrated partial loss of deciduum,focal thinness or absence of myometrium,nodular interface between placenta and uterus,heterogeneous signal intensities within placenta,bands of hypo intensities within placenta on T2WI,loss or diminish of the inter space between placenta and bladder.Conclusion:MRI and US play an important role in the diagnosis of placenta previa and accompanying placenta accreta,they are complementary

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引用

  1. fsxsj.tjh.com.cn:前置胎盘和胎盘前置状态的MRI诊断价值-Value of MRI in the diagnosis of placenta previa

供执业医师工作参考,不替代临床判断;数值与分级以指南原文为准。