恶性滋养细胞肿瘤起源于胎盘绒毛的滋养细胞具有不同于人类其它实体肿瘤的一般特性，它本身并无固有的血管，而是以滋养细胞逆行侵蚀子宫螺旋动脉或较大的各级子宫动脉分支，使子宫动脉直接开放进入管壁缺乏肌肉和弹力组织结构的新生血管，血管内皮被滋养细胞代替，造成了病灶 Malignant trophoblastic tumor trophoblast cells derived from placental villi have a general characteristic different from that of other human solid tumors. They do not have their own blood vessels, but instead erode uterine spiral arteries or uterine artery branches at various levels with trophoblastic cells retrogradely. The uterine artery is opened directly into the wall of the vessel, which lacks muscle and elastic tissue structure. The vascular endothelium is replaced by trophoblast cells and causes lesions.