Complete Hydatidiform Mole
A 26-year-old woman has had 14 weeks of amenorrhea, 3 days of light vaginal bleeding and persistent vomiting. The uterus measures 18 weeks and feels doughy, and no fetal heart is audible. Serum beta human chorionic gonadotropin is 320 000 IU/L, and ultrasound shows an enlarged uterus with a snowstorm appearance and no fetus. Which of the following is the most appropriate next step in management?
- A.Suction curettage of the uterusCorrect
- B.Total abdominal hysterectomy
- C.Hysterotomy and evacuation
- D.Medical termination with misoprostol
Explanation
A uterus larger than dates with a doughy consistency, absent fetal heart, markedly elevated beta human chorionic gonadotropin and a snowstorm or cluster-of-grapes appearance on ultrasound is a complete hydatidiform mole. The molar tissue arises from fertilization of an empty ovum, is diploid and entirely paternal in origin, and produces the exaggerated hormonal effects that explain hyperemesis, early pre-eclampsia, theca lutein cysts and occasionally hyperthyroidism. The definitive first-line treatment is suction curettage under ultrasound guidance, which is quick, preserves fertility and provides tissue for histological confirmation. Serial beta human chorionic gonadotropin monitoring afterwards is mandatory to detect gestational trophoblastic neoplasia, which follows about 15 to 20 percent of complete moles, and reliable contraception is advised until levels normalize and remain normal. Hysterectomy is reserved for women who have completed childbearing or who have uncontrolled bleeding, and it does not eliminate the need for follow-up. Hysterotomy is unnecessarily morbid for evacuating a mole. Medical methods with misoprostol are avoided because uterine contractions may embolize trophoblastic tissue and increase the risk of subsequent neoplasia, and evacuation is often incomplete.
Why each option
- A.
- Correct. Suction curettage is the gold standard evacuation for a hydatidiform mole, preserving fertility and providing histology, followed by serial beta hCG surveillance.
- B.
- Hysterectomy is reserved for women who have completed childbearing or have uncontrollable bleeding, and follow-up beta hCG monitoring is still required.
- C.
- Hysterotomy is an unnecessarily invasive abdominal procedure when transcervical suction evacuation achieves the same result.
- D.
- Medical evacuation with prostaglandins risks trophoblastic embolization and incomplete evacuation, and increases the likelihood of persistent trophoblastic disease.
Reference: RCOG Green-top Guideline No. 38, Gestational Trophoblastic Disease, 2021
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