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联胎的发生率约在1∶30,000至1∶165,000之间,平均为1∶50,000。大多数联胎是在出生时或由放射线摄片作出诊断。声象图筛选只有极严重的胎儿畸形才能清楚地诊断。作者报告Siamese双胎在妊娠12周时的诊断。一名23岁的病人第2胎,0产,月经规则,周期为33天。在第12周时作第1次临床检查,结果妇科检查正常,子宫增大与妊娠月份相符(11周又6天)。同时作常规声象图,声象图示单羊膜双胎妊娠,伴前壁胎盘,两胎头很接近(直径各17mm)。两头外形可相互分开,胸腹区从心脏水平至胎儿臀部两躯体联接在一起。胎动很活跃,在30分钟的观
The incidence of co-twins is about 1:30,000 to 1: 165,000 with an average of 1: 50,000. Most dermabrasions are diagnosed at birth or by radiography. Sonogram screening only a very serious fetal malformations can be clearly diagnosed. The authors report the diagnosis of Siamese twins at 12 weeks gestation. A 23-year-old patient’s second child, 0 births, menstrual rules, a period of 33 days. At Week 12, the first clinical examination was performed. The result of the gynecological examination was normal and the uterus increased in line with the month of pregnancy (11 weeks and 6 days). At the same time for the conventional sonogram, sonographic single lambs twin pregnancy, with anterior wall placenta, two fetal head is very close to (diameter 17mm). Two shapes can be separated from each other, the thoracoabdominal area from the heart to the fetus and the hips two bodies connected together. Fetal movement is very active in the 30 minutes view