| Placental site trophoblastic tumor | |
|---|---|
 | |
| Photomicrograph showing proliferating intermediate trophoblast with scarce cytotophoblastic and syncytiotrophoblastic elements | |
| Specialty | Oncology, obstetrics |
Placental site trophoblastic tumor is a form of gestational trophoblastic disease, which is thought to arise from intermediate trophoblast.[1]
The tumor may secrete human placental lactogen,[2] and result in a false-positive pregnancy test.[3]
A placental site trophoblastic tumor is a monophasic neoplasm of the implantation site intermediate trophoblast, and usually a benign lesion, which comprises less than 2% of all gestational trophoblastic proliferations. Preceding conditions include molar pregnancy (5%). Compared to choriocarcinoma or invasive mole, hemorrhage is less conspicuous and serum β-HCG level is low, making early diagnosis difficult.
Immunohistochemistry: Often stains with hPL, keratin, Mel-CAM, EGFR.