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| *Abbreviated ''EPS''. | | *Abbreviated ''EPS''. |
| *Previously known as ''syncytial endometritis''.<ref>URL: [http://www.webpathology.com/image.asp?case=565&n=7 http://www.webpathology.com/image.asp?case=565&n=7]. Accessed on: 22 May 2014.</ref> | | *Previously known as ''syncytial endometritis''.<ref>URL: [http://www.webpathology.com/image.asp?case=565&n=7 http://www.webpathology.com/image.asp?case=565&n=7]. Accessed on: 22 May 2014.</ref> |
| | | {{Main|Exaggerated placental site}} |
| ===General===
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| *Benign.
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| Definition:
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| *"Increased number" of implantation-site [[Intermediate trophoblast|intermediate trophoblastic cells]].
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| Note:
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| *Used to go by a terrible old term: ''syncytial endometritis'':<ref name=ouhsc_kfung>URL: [http://moon.ouhsc.edu/kfung/IACP-OLP/TC-Text/TC-01-Supp.pdf http://moon.ouhsc.edu/kfung/IACP-OLP/TC-Text/TC-01-Supp.pdf]. Accessed on: 15 August 2011.</ref>
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| **Not syncytial -- mostly.
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| **Not inflammatory.
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| ===Microscopic===
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| Features:<ref name=ouhsc_kfung/>
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| *Intermediate trophoblast:
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| **Abundant (eosinophilic) cytoplasm.
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| *Usu. adjacent to:
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| **[[Chorionic villi]].
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| **Decidua - endometrial stromal cells with a nucleus central, eosinphilic cytoplasm, well-defined cell borders.
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| *No mitotic activity.
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| *Ectatic blood vessels.
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| DDx:
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| *[[PSTT]].
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| ===IHC===
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| *MIB1 ~0%.
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| **Used to differentiate from [[PSTT]].
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| ==Placental site trophoblastic tumour== | | ==Placental site trophoblastic tumour== |