胎头前不均倾、高直后位及颏后位均属严重胎头位置异常，其临床表现有相似之处，一般均难以经阴道分娩，如不早期识别，恰当处理，会给母儿带来严重危害．我院收治３４例，现分析报道如下．１临床资料１．１一般资料：我院自１９９４年６月至１９９８年６月，四年间共分娩... Uneven pre-fetal incision, posterior straight chin and posterior position are a serious abnormal fetal head position, its clinical manifestations are similar, are generally difficult to vaginal delivery, if not early identification, proper treatment, give the mother Serious damage. 34 cases admitted to our hospital, the analysis is reported as follows. 1 Clinical data 1.1 General Information: Our hospital from June 1994 to June 1998, a total of four years of childbirth ...