Final answer:
The three classic microscopic findings of a molar pregnancy are hydropic villi, trophoblastic hyperplasia, and trophoblastic pseudoinclusions.
Step-by-step explanation:
A molar pregnancy, also known as a hydatidiform mole, is a type of gestational trophoblastic disease. It occurs when the fertilized egg develops into a mass of abnormal cells inside the uterus instead of a healthy fetus. There are three classic microscopic findings associated with a molar pregnancy:
- Hydropic villi: These are swollen, edematous villi that lack fetal blood vessels. They appear as grape-like clusters under the microscope.
- Trophoblastic hyperplasia: This refers to the excessive proliferation of trophoblastic cells, which are responsible for implantation and formation of the placenta.
- Trophoblastic pseudoinclusions: These are cell nuclei that resemble inclusions but are actually normal nuclei within the trophoblastic cells. They are a characteristic feature of molar pregnancies.