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。
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Objective: to study the pathogenesis, pathological features of placental site intermediate trophoblast disease and to discuss the method of efficient treatment.