This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gestational Trophoblastic Disease, Subject name: Gynaecology & Obstetrics
Possible causes of choriocarcinoma after hydatidiform mole are all except: 
Select and explain. 
A. Rising hCG, B. More theca lutein cysts, C. Increased uterus size, D. Suburethral nodule
D: Suburethral nodule
Answer: D: Suburethral nodule 
Explanation: Ans. D. Suburethral nodule* Choriocarcinoma consists of sheets of anaplastic cytotrophoblast and syncytiotrophoblast cells without chorionic villi.* Metastases are always choriocarcinoma.* Choriocarcinomas are commonly accompanied by ovarian theca lutein cysts.* Choriocarcinoma is seen in postmenopausal women.* Pelvic mass is also palpable.* | hCG level is seen in choriocarcinoma.