Which one of the following is not true regarding choriocarcinoma?
**Core Concept**
Choriocarcinoma is a type of **gestational trophoblastic disease (GTD)**, which originates from the trophoblastic cells of the placenta. It is characterized by the absence of fetal parts and the presence 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 high propensity for **hematogenous spread**. It is highly sensitive to **chemotherapy**, particularly methotrexate and actinomycin D. The diagnosis is often made based on elevated **hCG levels** and histopathological examination.
**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific details of option A, it's challenging to provide a direct explanation. However, any statement contradicting the aggressive nature, chemosensitivity, or association with high hCG levels of choriocarcinoma would be incorrect.
**Option B:** Similarly, without specifics, any claim that choriocarcinoma does not originate from trophoblastic cells or is not associated with GTD would be incorrect.
**Option C:** Again, lacking details, but if it suggests that choriocarcinoma is not capable of distant metastasis or does not have a tendency to invade the uterus, it would be incorrect.
**Option D:** If this option states that choriocarcinoma is not responsive to chemotherapy or does not produce hCG, it would be incorrect.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that choriocarcinoma is highly responsive to chemotherapy, and **elevated hCG levels** are a crucial marker for diagnosis and monitoring of the disease.
**Correct Answer:** Not provided in the query.