Final answer:
The three types of malignant gestational trophoblastic diseases are Choriocarcinoma, Placental-site trophoblastic tumor, and Epithelioid trophoblastic tumor, all of which derive from the trophoblastic tissue associated with pregnancy.
Step-by-step explanation:
The three types of malignant gestational trophoblastic diseases (GTD) are:
- Choriocarcinoma
- Placental-site trophoblastic tumor
- Epithelioid trophoblastic tumor
These conditions develop from the trophoblastic tissue, which is part of the developing embryo and normally contributes to the formation of the placenta through attachment of the blastocyst to the uterine wall. The trophoblast forms part of the blastula and contains stem cells which differentiate into the germ layers endoderm, ectoderm, and mesoderm. The trimester division refers to the division of pregnancy into three equal three-month terms, and gestational trophoblastic diseases can present with symptoms at any time during these periods.