| Placental site nodule (PSN) | paucicellular, hyaline material | no mitotic activity |
| Exaggerated placental site (EPS) | abundant intermediate trophoblasts - between muscle | no mitotic activity |
| Placental site trophoblastic tumour (PSTT) | abundant cytoplasm - not clear, dyscohesive | +/-multinucleation |
| Epithelioid trophoblastic tumour (ETT) | nests of cells in hyaline stroma | eosinophilic cytoplasm, central nucleus |
| Choriocarcinoma | polygonal cells with clear cytoplasm (cytotrophoblasts) | multinucleated cells with smudged nuclei (syncytiotrophoblasts), no chorionic villi |
