Conclusions EPS is a kind of gestational trophoblastic disease primarily involving IT.It may be a preneoplastic lesion of placental site trophoblastic tumor (PSTT).

• 结论EPS反应属于中间型滋养细胞为主的妊娠滋养细胞疾病，可能为胎盘部位滋养细胞肿瘤的前期病变。