Which of the following is the most common cause of persistent trophoblastic disease after H. Mole evacuation?
💡 Explanation
## **Core Concept**
Persistent trophoblastic disease (PTD) or gestational trophoblastic neoplasia (GTN) can occur after evacuation of a hydatidiform mole. The condition arises from the abnormal proliferation of trophoblastic tissue. Understanding the risk factors and causes of PTD is crucial for managing patients post-evacuation.
## **Why the Correct Answer is Right**
The correct answer, **Gestational trophoblastic neoplasia (GTN)**, specifically **Invasive mole**, is a common cause of persistent trophoblastic disease. An invasive mole occurs when molar tissue invades the myometrium, leading to potential bleeding and persistence of the disease. This condition often requires further treatment beyond simple evacuation, such as chemotherapy.
## **Why Each Wrong Option is Incorrect**
- **Option A:** While **Complete hydatidiform mole** has a higher risk of progressing to GTN compared to a partial mole, it is not the direct cause of persistent trophoblastic disease but rather a risk factor.
- **Option B:** **Partial mole** has a lower risk of GTN compared to a complete mole but is still a type of molar pregnancy rather than a cause of persistent disease.
- **Option C:** **Chorocarcinoma** is a type of gestational trophoblastic neoplasia but is less common than invasive mole as a direct sequel to molar evacuation.
## **Clinical Pearl / High-Yield Fact**
A high-yield fact to remember is that **high hCG levels (>20,000 IU/L) 4 weeks post-evacuation** and **uterine size larger than dates** are risk factors for persistent trophoblastic disease. Monitoring hCG levels post-evacuation is crucial for early detection.