Gestational choriocarcinoma vs Non-gestational choriocarcinoma
How to tell Gestational choriocarcinoma and Non-gestational choriocarcinoma apart when a board question makes them look alike.
Gestational choriocarcinoma follows pregnancy events; non-gestational choriocarcinoma is a germ cell tumor without pregnancy origin.
Side by side
Gestational choriocarcinoma follows molar pregnancy, abortion, ectopic pregnancy, or term pregnancy with high hCG and early hematogenous metastasis.
Non-gestational choriocarcinoma arises from germ cells, often in ovary or testis, and is not genetically related to a pregnancy.
Malignant trophoblast proliferates without chorionic villi after a gestational event and often remains highly chemotherapy responsive.
Malignant germ cell differentiation into trophoblastic tissue produces hCG-secreting tumor independent of a prior gestation.
Persistently elevated hCG after mole evacuation, uterine mass, lung metastases, and a clear prior pregnancy event support gestational disease; genetics vary by precursor event.
Gonadal mass, mixed germ cell tumor elements, hCG elevation, and absence of preceding pregnancy support non-gestational disease.
The trap
Both secrete hCG and metastasize early, so pregnancy history and tumor origin separate them.
The repair move
For choriocarcinoma, tie the hCG-secreting tumor to either a pregnancy event or a germ cell origin.
Try a free question
CoreA 26-year-old woman had evacuation of a complete hydatidiform mole 12 weeks ago. Surveillance beta-hCG, which initially fell, has now plateaued at 18,000 mIU/mL for the last 3 weeks. Chest CT shows multiple lung nodules. Which diagnosis is most likely?
Show answer and explanation
Answer: A. Gestational choriocarcinoma. Gestational choriocarcinoma follows molar, abortive, or term pregnancy; persistent or rising hCG after evacuation plus lung metastases is the classic presentation, and the disease is highly chemosensitive.
Why the other choices are tempting
- B. Non-gestational choriocarcinoma arises from germ cells without a preceding pregnancy event; the recent molar history points to gestational origin.
- C. A new intrauterine pregnancy would show a gestational sac on ultrasound; persistent post-molar hCG plateau with lung nodules is malignant disease.
- D. Pulmonary tuberculosis would show cavitary lesions or upper-lobe disease with positive sputum studies, not hCG elevation.
- E. Metastatic lung adenocarcinoma in a 26-year-old without smoking is uncommon and would not produce hCG elevation.
Flashcards
Tap a card to flip it.
What prior event supports gestational choriocarcinoma?
A prior mole, abortion, ectopic pregnancy, or term pregnancy supports gestational choriocarcinoma.
What marker is elevated in choriocarcinoma?
hCG is elevated because trophoblastic tumor cells secrete it.
Quick answers
What is the fastest way to tell Gestational choriocarcinoma from Non-gestational choriocarcinoma?
Gestational choriocarcinoma follows pregnancy events; non-gestational choriocarcinoma is a germ cell tumor without pregnancy origin.
What is the key clue for Gestational choriocarcinoma?
Gestational choriocarcinoma follows molar pregnancy, abortion, ectopic pregnancy, or term pregnancy with high hCG and early hematogenous metastasis.
What is the key clue for Non-gestational choriocarcinoma?
Non-gestational choriocarcinoma arises from germ cells, often in ovary or testis, and is not genetically related to a pregnancy.
What is the common trap with Gestational choriocarcinoma vs Non-gestational choriocarcinoma?
Both secrete hCG and metastasize early, so pregnancy history and tumor origin separate them.