孕妇,20岁,孕1产0。孕13周超声检查为宫内单活胎。孕29周检查,双顶径7.5cm,股骨长5.3cm,胎儿腹部于左肾上方见一境界清楚的囊实性包块,大小3.1cm×2.6cm,其内见中等回声1.3cm×1.2cm(图1(1))。孕32周超声发现该包块增大,实性部分内见线样强回声,疑似寄生胎或畸胎瘤(图1(2))。孕39周超声发现该包块增大至8.0cm×6.8cm,其内混合性团块约6.4cm×3.6cm,有圆 Pregnant women, 20 years old, pregnant 1 produce 0. 13 weeks pregnant ultrasound examination for intrauterine single live births. Pregnancy 29 weeks examination, biparietal diameter 7.5cm, femur 5.3cm, fetal abdomen in the left kidney to see a real clear cystic solid mass, the size of 3.1cm × 2.6cm, which see the medium echo 1.3cm × 1.2cm (Figure 1 (1)). 32 weeks pregnant ultrasound found that the mass increases, see the real part of the strong echoes within the line, suspected parasitic or teratoma (Figure 1 (2)). 39 weeks pregnant ultrasound found that the mass increased to 8.0cm × 6.8cm, within the mixed mass of about 6.4cm × 3.6cm, round