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1病例资料32岁,孕2产1。孕21周到我院常规孕期检查。平素月经规律,孕期无感染、发热、服药、接触射线及遗传病史。彩超检查示:双胎,一胎儿双顶径5.1 cm,脊柱排列延续规整,胎心搏动规律,腹围15.0 cm,股骨长3.0 cm,胎儿双肾、膀胱、胃泡、四肢等未见明显异常,脐带为2条脐动脉及1条脐静脉。另一胎儿呈团状,无头、无颈胸,骶尾部可见椎体回声,未见胎儿心脏、其他内脏及上肢,可见双下肢,腹部及
1 case data 32 years old, 2 pregnant and 1. Pregnancy 21 weeks to our hospital routine pregnancy check. Normal menstrual regularity, no infection during pregnancy, fever, medication, exposure to radiation and genetic history. Color ultrasonography showed: twins, a fetus biparietal diameter of 5.1 cm, spinal alignment continued regularity, fetal heart beat, abdominal circumference 15.0 cm, femur length 3.0 cm, fetus kidneys, bladder, stomach bubble, limbs, etc. no significant abnormalities , Umbilical cord 2 umbilical artery and a umbilical vein. Another fetus was clumpy, no head, no neck, vertebral echo visible sacrococcygeal, no fetal heart, other viscera and upper limbs, showing both lower extremities, abdomen and