孕妇27岁,孕31周。超声检查:BPD 7.8cm,FL 6.1cm,胎儿右腹腔内肾上腺前方探及3.0cm×2.8cm×2.2cm囊实性包块,边界清,实性部分大小1.8cm×1.1cm,内见点状血流信号。超声提示:胎儿右腹腔内囊实性包块(性质待定)(图1)。孕36周超声检查:包块内实性部分可见肢体强回声,胎体长约4.0cm,诊断为胎儿腹腔内寄生胎(图2)。孕妇足月产一女婴,生后18d超声检查,包块长径为 Pregnant women 27 years old, 31 weeks pregnant. Ultrasonography: BPD 7.8cm, FL 6.1cm, fetal right intraperitoneal adrenal exploration and 3.0cm × 2.8cm × 2.2cm cystic mass, the border clear, the real part of the size of 1.8cm × 1.1cm, Blood flow signal. Ultrasound Tip: fetal intraperitoneal cystic solid mass (to be determined) (Figure 1). 36 weeks pregnant ultrasound examination: solid mass within the mass visible limb echoes, carcass length of about 4.0cm, diagnosed as intrauterine fetal fetus (Figure 2). Full-term pregnant women, a baby girl, 18d ultrasound after birth, mass length of the block