A 32-year-old woman from rural India presents with vaginal bleeding and a uterine size larger than expected for gestational age at 12 weeks. Ultrasound shows a heterogeneous mass with multiple small cystic spaces ('bunch of grapes' appearance) and no fetal parts. β-hCG is 250,000 mIU/mL. She has no history of prior molar pregnancy or chemotherapy. What is the most appropriate immediate next step?

Explanation

## Clinical Presentation: Complete Molar Pregnancy This patient has a **complete hydatidiform mole** with classic features: - First-trimester presentation with abnormal bleeding - Uterus larger than expected for dates - Pathognomonic ultrasound: 'bunch of grapes' (multiple small vesicles) - No fetal tissue - Markedly elevated β-hCG (250,000 mIU/mL) ## Management of Uncomplicated Molar Pregnancy ```mermaid flowchart TD A[Complete molar pregnancy diagnosed]:::outcome --> B{Hemodynamically stable?}:::decision B -->|Yes| C[Suction evacuation under GA]:::action B -->|No| D[Stabilize, manage hemorrhage]:::urgent D --> C C --> E[Send tissue for histology]:::action E --> F[Monitor β-hCG weekly × 3 weeks]:::action F --> G{β-hCG normalizes?}:::decision G -->|Yes| H[Continue surveillance 6-12 months]:::action G -->|No| I[Evaluate for persistent GTN]:::action ``` ## Why Evacuation, Not Chemotherapy? **Key Point:** Uncomplicated molar pregnancy is treated by **evacuation alone**, not chemotherapy. Chemotherapy is reserved for: - Persistent GTN (β-hCG plateau or rise post-evacuation) - Invasive mole or choriocarcinoma - High-risk features (age >40, prior molar pregnancy, high β-hCG) **High-Yield:** About 15–20% of complete moles progress to persistent GTN; 5% develop choriocarcinoma. Therefore, **post-evacuation surveillance is mandatory**, but chemotherapy is NOT given upfront. **Clinical Pearl:** Suction evacuation is the gold standard for molar pregnancy evacuation because it: 1. Minimizes uterine perforation risk 2. Allows complete removal of molar tissue 3. Preserves the uterus for future pregnancy **Mnemonic: EVACUATE-MONITOR-TREAT** - **E**vacuate the mole (suction) - **V**alue the tissue (histology) - **A**ssess β-hCG weekly - **C**hemotherapy only if persistent ## Why NOT the Other Options? | Option | Why Incorrect | |--------|---------------| | **Immediate methotrexate monotherapy** | Chemotherapy is not given for uncomplicated molar pregnancy. Methotrexate is used only for low-risk persistent GTN (β-hCG plateau/rise post-evacuation). Giving chemotherapy before evacuation is inappropriate and increases toxicity without benefit. | | **Combination chemotherapy (EMA/CO)** | Reserved for high-risk persistent GTN or choriocarcinoma. This patient has uncomplicated molar pregnancy; EMA/CO would cause unnecessary toxicity. Combination therapy is indicated only if persistent disease develops post-evacuation. | | **Progesterone + repeat ultrasound** | Delays definitive management. Molar pregnancy is a surgical diagnosis confirmed by ultrasound and β-hCG; progesterone level is not diagnostic. Waiting 2 weeks risks hemorrhage, uterine perforation, and complications. Evacuation should not be delayed. | **Warning:** Do not confuse: - ~~Uncomplicated molar pregnancy~~ → requires evacuation only - **Persistent GTN** → requires chemotherapy post-evacuation **Tip:** The exam often tests whether you know that **most molar pregnancies do NOT need chemotherapy**. Chemotherapy is reserved for the 15–20% that persist or progress.