PURPOSE The aim of this study is to provide normative data about the appearances and dimensions of the cavum septi pellucidi and vergae (CSPV) on in utero MR (iuMR) imaging in second and third trimester foetuses. METHODS Two hundred normal foetuses (from a low-risk pregnancy, with normal ante-natal USS findings and no intracranial abnormality of iuMR) had iuMR imaging between 18 and 37 gestational weeks (gw). The anatomical features on those studies were compared with published atlases of post-mortem foetal brains. The length, width and volume of the CSPV were measured in all foetuses. RESULTS The anatomy of the CSPV and its relationship with the corpus callosum and the fornices on iuMR imaging was comparable with post-mortem data at all gestational ages studied. The length of the CSPV increased throughout pregnancy, whereas the width and volume of CSPV reached a maximum between 29 and 31 gw and then showed a reduction later in pregnancy. CONCLUSION The iuMR imaging features of the CSPV and its close anatomical relations closely correspond to post-mortem data. The CSPV was patent in all cases but we have shown that closure commences in the midpart of the third trimester and advances in a posterior to anterior direction.

中文翻译：

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宫腔MR成像中胎儿腔隔膜和疣的正常外观和尺寸。

目的本研究的目的是提供有关中晚期胎儿子宫内MR（iuMR）成像中牙本质分隔和疣状（CSPV）的外观和尺寸的规范数据。方法200例正常胎儿（来自低危妊娠，具有正常的产前USS检查结果，颅内未见iuMR异常）在18至37个孕周（gw）之间进行了iuMR成像。将这些研究的解剖学特征与已发表的死后胎儿脑图谱进行了比较。在所有人群中测量CSPV的长度，宽度和体积。结果iuMR成像中CSPV的解剖结构及其与call体和前突的关系在所有研究胎龄均与验尸数据相当。在整个怀孕期间，CSPV的长度增加，而CSPV的宽度和体积在29至31 gw之间达到最大值，然后在怀孕后期有所减少。结论CSPV的iuMR成像特征及其紧密的解剖关系与验尸数据密切相关。CSPV在所有情况下均已申请专利，但我们已显示，闭合术始于妊娠中期，并从后到前。