孕妇，２６岁，孕３２周，初产，家族无残疾及畸形史，曾于孕４＋在外院检查未见异常。作常规Ｂ超检查见：宫内见一头位胎儿，双顶径７８ｃｍ，头颅光环完整，脑中线居中，胎心搏动规律，１２６次／分，胎动正常，探测双上肢均仅见手掌连于一条长骨远端，未见前上臂尺，... Pregnant women, 26 years old, 32 weeks pregnant, primiparous, family history of no disability and deformity, had no abnormalities in pregnancy 4+ examination in the outer court. For routine B-ultrasound see: intrauterine see a bit of fetus, biparietal diameter 7  8cm, complete aura, head center, fetal heart rate beating, 126 beats / min, normal fetal movement, detection of both upper extremities are only seen in the palm of your hand A long bone distal, no upper arm before the foot, ...