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Difficulty: HardGynecologic Oncology

A 26-year-old nulliparous woman undergoes an uncomplicated suction dilation and curettage for a histologically confirmed complete hydatidiform mole. Arrange the following clinical steps and milestones in the correct chronological sequence for her standard pathway, culminating in the management of low-risk gestational trophoblastic neoplasia (GTN).

  1. 1Prescription of highly effective contraception to prevent a new pregnancy from confounding biomarker surveillance.
  2. 2Serial weekly assessment of serum β\beta-hCG levels to ensure an appropriate post-evacuation decline.
  3. 3Identification of a plateau in serum β\beta-hCG levels over three consecutive weeks.
  4. 4Evaluation for metastatic disease and calculation of the WHO prognostic score.
  5. 5Initiation of definitive medical management with single-agent methotrexate.

Answer

The correct chronological sequence is: (1) Prescription of highly effective contraception, (2) Serial weekly assessment of serum β\beta-hCG levels, (3) Identification of a plateau in serum β\beta-hCG levels, (4) Evaluation for metastatic disease and calculation of the WHO prognostic score, and (5) Initiation of definitive medical management with single-agent methotrexate.
The correct sequence logically follows the natural history and standard protocol for a molar pregnancy progressing to GTN. Contraception is mandatory immediately post-procedure to ensure reliable surveillance. Weekly β\beta-hCG monitoring is the standard initial follow-up. When a plateau occurs (4 values over 3 weeks), GTN is officially diagnosed. Once diagnosed, anatomical staging is strictly required to calculate the WHO prognostic score before any treatment is given. Finally, treatment with methotrexate is initiated specifically because the staging confirmed low-risk disease.

Step-by-Step Solution

1
Start highly effective contraception immediately post-evacuation.
Prevention of a new pregnancy during the high-risk surveillance period.
A new normal pregnancy would raise β\beta-hCG levels, making it impossible to detect malignant transformation to GTN.
2
Implement the surveillance protocol with weekly serum β\beta-hCG monitoring.
Tracking the decline of the tumor marker following molar evacuation.
To ensure complete resolution of trophoblastic tissue and identify early signs of persistent or malignant disease.
3
Diagnose gestational trophoblastic neoplasia based on biomarker trends.
Formal diagnosis of post-molar GTN.
A plateau in β\beta-hCG levels (4 values over 3 weeks) or a consecutive rise meets the formal FIGO diagnostic criteria for GTN.
4
Order comprehensive staging imaging.
Evaluation for metastasis and calculation of the WHO prognostic score.
Anatomical staging is strictly required prior to any treatment to calculate the WHO score, which dictates the intensity of chemotherapy.
5
Administer targeted chemotherapy.
Definitive treatment of the neoplasm.
Low-risk GTN (WHO score <7< 7) is highly curable and appropriately treated with single-agent chemotherapy such as methotrexate.

Key Concept

Chronological diagnosis, staging, and management pathway for Gestational Trophoblastic Neoplasia (GTN)
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Topics

Gynecologic Oncology

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