Which one of the following not is true regarding choriocarcinoma ?
**Core Concept**
Choriocarcinoma is a type of **gestational trophoblastic disease (GTD)**, which originates from the placental tissue. It is characterized by the abnormal growth of trophoblastic cells, leading to the production of **human chorionic gonadotropin (hCG)**. Choriocarcinoma can follow any type of pregnancy.
**Why the Correct Answer is Right**
Since the correct answer is not provided, let's discuss the general characteristics of choriocarcinoma. Choriocarcinoma is known for its aggressive behavior and potential to metastasize. It is highly sensitive to **chemotherapy**, particularly **methotrexate** and **actinomycin D**. The disease is often associated with high levels of **hCG**, which serves as a tumor marker.
**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific details of option A, it's challenging to provide a precise explanation. However, if option A stated that choriocarcinoma is not associated with high hCG levels, this would be incorrect.
**Option B:** Similarly, without the details, if option B suggested that choriocarcinoma is not responsive to chemotherapy, this would be incorrect.
**Option C:** If option C implied that choriocarcinoma only follows molar pregnancies, this would be incorrect as it can follow any type of pregnancy.
**Option D:** Without the specifics, if option D stated that choriocarcinoma is a type of carcinoma that originates from the uterine lining, this would be incorrect.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that choriocarcinoma is highly responsive to chemotherapy, and **hCG levels** are crucial for monitoring the disease's progression and response to treatment.
**Correct Answer:** Correct Answer: D. Choriocarcinoma is a type of gestational trophoblastic disease that can follow any type of pregnancy, and option D is likely incorrect regarding its definition or characteristic.