Background. The purpose of this study is to evaluate the accuracy of prenatal MRI in diagnosing choledochal cysts (CDC), evaluate the sensitivity and specificity of MRI signs in the diagnosis of fetal CDC, and first compare the trend of size of CC between prenatal and postpartum. Methods. A total of 18 fetal who were diagnosed with CDCs through prenatal MRI were enrolled in the study. We summarized and analyzed the prenatal clinical data and prognosis information of prenatal and postpartum surgery, then compared the sensitivity, specificity, and diagnostic accuracy of various signs of MRI and postpartum MRCP diagnosis of CC. Finally, we tried to compare the earliest prenatal detection of common bile duct cysts with the size of surgery, and calculated the growth rate of common bile duct cysts for the first time. Results. All 18 patients were delivered in our institution. Among these patients, 14 were confirmed with CDCs after postpartum surgery, two patients had CDCs that disappeared, and two patients were confirmed with cystic biliary atresia (CBA) through the Kasai operation. Furthermore, 13 patients with CDCs and two patients with CBA underwent MRCP before the operation, and one patient with CDCs ruptured at birth and underwent ultrasound diagnosis. The sensitivity and diagnostic compliance of prenatal MRI signs for the location were higher when compared to postnatal MRCP (100% vs. 76.9% and 83.3% vs. 66.7%): the cyst was located at the porta hepatis, which was higher than the lowest edge of the liver, and parallel to the hepatoduodenal ligament. Conclusion. Prenatal MRI is higher than that of US for diagnosing CDCs, specifically in identifying the location of the cyst and confirming the origin of the cyst. The length, width, and size of the CDC become slightly bigger in our study.

中文翻译：

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磁共振成像在胆总管囊肿产前诊断中的准确性：单中心回顾性分析

背景。本研究旨在评估产前MRI诊断胆总管囊肿（CDC）的准确性，评估MRI体征诊断胎儿CDC的敏感性和特异性，并首先比较产前和产后CC大小的趋势。方法. 共有 18 名通过产前 MRI 诊断为 CDC 的胎儿参加了该研究。我们总结和分析了产前和产后手术的产前临床资料和预后信息，然后比较了 MRI 和产后 MRCP 诊断 CC 的各种体征的敏感性、特异性和诊断准确性。最后，我们尝试将胆总管囊肿的最早产前检测与手术的大小进行比较，并首次计算出胆总管囊肿的生长速度。结果. 所有 18 名患者均在我院分娩。在这些患者中，14名患者在产后手术后确诊为CDC，2名患者CDC消失，2名患者通过Kasai手术确诊为胆囊性胆道闭锁（CBA）。此外，13 例 CDC 患者和 2 例 CBA 患者术前行 MRCP，1 例 CDC 患者出生时破裂并接受超声诊断。与产后 MRCP 相比，产前 MRI 体征对该位置的敏感性和诊断依从性更高（100% vs. 76.9% 和 83.3% vs. 66.7%）：囊肿位于肝门，高于最低肝脏边缘，与肝十二指肠韧带平行。结论. 产前 MRI 在诊断 CDC 方面高于美国，特别是在确定囊肿的位置和确认囊肿的起源方面。在我们的研究中，CDC 的长度、宽度和大小变得略大。