凶险性前置胎盘(pernicious placenta previa,PPP)是指附着于子宫下段剖宫产瘢痕处的前置胎盘,伴或者不伴胎盘植入。随着我国二孩政策的开放,PPP的患病率明显升高,且剖宫产次数越多,PPP合并胎盘植入的发生率越高。其可能与剖宫产术后子宫内膜受损、子宫切口瘢痕愈合不良等密切相关。PPP尤其是合并胎盘植入时,易发生大出血,甚至危及母体生命,术中可能切除子宫。因此,加强对PPP的孕期及 Pernicious placenta previa (PPP) refers to the placenta previa attached to the lower uterine cicatricial placenta, with or without placenta accreta. With the opening of the second child policy in our country, the prevalence of PPP increased significantly, and the more cesarean delivery times, the higher the incidence of PPP combined with placenta accreta. It may be related to cesarean section after endometrial damage, uterine incision scar healing is closely related. PPP, especially in combination with placenta accreta, prone to bleeding, and even endanger maternal life, surgery may remove the uterus. Therefore, to strengthen the pregnancy of PPP and