[The clinical and pathological characteristics of exaggerated placental site].

OBJECTIVES

To study the pathological and clinical features of exaggerated placental site (EPS) and to propose its diagnostic criteria and differential diagnosis.

METHODS

The pathological features, immunohistochemical marks, clinical characteristics and prognosis of 13 cases with EPS were studied and analyzed.

RESULTS

The histological feature of EPS was that trophoblasts mainly intermediate trophoblast (IT), infitrated into decidua and myometrium layers, while original histological structure was not destroyed, and placental site features remained partially. The immunohistochemical marks of EPS, HPL and EMA, were positive or strongly positive. The primary clinical presentation of EPS was postpartum hemorrhage and the prognosis was good in 5 years.

CONCLUSIONS

EPS is a kind of gestational trophoblastic disease primarily involving IT. It may be a preneoplastic lesion of placental site trophoblastic tumor (PSTT). Its differential diagnosis depend on combining histological, immunohistochemical findings, and clinical features. Attentions should be paid to EPS in cases with postpartum hemorrhage.