探讨双下腔静脉并右肾重复肾胎儿产前超声诊断学特征。

回顾性分析2019年8月5日湖北省妇幼保健院超声科诊断的1例双下腔静脉并右肾重复肾胎儿的产前超声资料，总结双下腔静脉的超声声像图特征，并复习文献。

胎儿超声检查右肾见2个肾盂和2组肾静脉，腹部冠状切面显示下腔静脉在肾脏水平向左跨过腹主动脉，肾水平以下与腹主动脉并行左、右侧各见一支下腔静脉，呈"平行三血管征"，双下腔静脉血流走行一致。彩色多普勒超声显示双下腔静脉与腹主动脉血流方向相反，并记录到静脉频谱。

掌握双下腔静脉胚胎学基础及超声声像图特征，有利于提高产前超声检出率。

To investigate the characteristics of prenatal ultrasound in diagnosis of double inferior vena cava and right duplex kidney in fetus.

The prenatal ultrasonographic data of a fetus with double inferior vena cava and right duplex kidney who was diagnosed by the Ultrasound Department of Hubei Maternal and Child Health Hospital on August 5, 2019 was analyzed retrospectively, and the relevant literatures were reviewed.

Fetal ultrasound examination showed that two renal pelvis and two groups of renal veins were found in the right kidney. The coronal section image of the abdomen showed that the inferior vena cava crossed the abdominal to the left at the renal level, with one vena cava parallel to the abdominal aorta to the left and one vena cava parallel to the right at the renal level. The inner diameter of the double inferior vena cava was basically consistent. Color Doppler ultrasound showed the flow of the double inferior vena cava in the opposite direction to that of the abdominal aorta and recorded the venous spectrum.

To grasp the embryological basis of the double inferior vena cava and the characteristics of ultrasonography is of great guiding value for improving the detection rate of prenatal ultrasound.