探讨胎儿交叉异位融合肾（CFRE）产前超声声像图特征。

对2014年1月至2015年5月在首都医科大学附属北京妇产医院产前超声诊断的7例交叉异位融合肾胎儿超声声像图表现和产后检测结果进行总结分析。

7例交叉异位融合肾胎儿产前超声均不能在一侧肾区显示正常肾脏回声，另一侧肾区或较低位置探及增大融合的肾脏（"S"形融合肾3例，"L"形融合肾2例，盘状肾1例，团块肾1例）；其中左肾异位至右侧5例，右肾异位至左侧2例。伴发其他系统畸形包括：脊柱骶尾部发育不良1例，多囊性肾发育不良2例，同时伴发左心发育不良综合征和脊柱骶尾部发育不良1例。

交叉异位融合肾有典型声像图特征，产前超声可明确诊断胎儿交叉异位融合肾并发现与其相关的复杂合并畸形，产前超声诊断交叉异位融合肾对指导产科处理和胎儿出生后手术治疗有重要指导作用。

To discuss the prenatal ultrasound manifestations of crossed-fused ectopic kidney.

An analysis of prenatal ultrasound findings and postnatal autopsy features was performed on seven cases of fetuses with crossed fused renal ectopia that were identified by ultrasonography at Beijing obstetrics and gynecology hospital, in the period of January 2014 to May 2015.

Of 7 fetuses with crossed fused renal ectopia,the kidneys were ectopic from left to right in 5 fetuses and from right to left in 2 fetuses. The two kidneys were S-shaped fusion in 3 fetuses, L-shaped fusion in 2 fetuses, and disc-shaped fusion in one fetus, cake-shaped fusion in one fetus.Complicated malformations: hypoplastic left heart syndrome in one case, spinal cord malformation in2 cases, multicystic dysplastic kidney in 2 cases.

Fetuses with CFRE have characteristic prenatal ultrasound imaging, prenatal ultrasonography can provide reliable informations in the diagnosis of this disease. Prenatal diagnosis of CFRE can provide guidance for clinical obstetrical management and postnatal treatment.