双胎头位发生胎头碰撞者并不多见。笔者将所收集到的 1990年以来发生的 2例报道如下 :例 1 初产妇 ,2 5岁。Ｇ1 Ｐ0 ,39周妊娠 ,孕期曾多次在某乡镇卫生院产前检查 ,未提示双胎妊娠。入院检查 :宫高 38ｃｍ ,腹围 98ｃｍ ,胎位ＬＯＡ ,胎心规律 ,骨盆外测量正常。宫口开 5ｃｍ Twin head position occurred fetal head collision is rare. The author collected two cases occurred since 1990 as follows: Example 1 primipara, 25 years old. G1 P0, 39 weeks of pregnancy, pregnancy has repeatedly in a township hospital prenatal care, did not prompt twin pregnancy. Admission examination: Palace 38cm high, abdominal circumference 98cm, fetal LOA, fetal heart rate, normal pelvic measurement. Palace mouth open 5cm