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Difficulty: MediumGynecologic Oncology

A 29-year-old woman is brought to the emergency department due to a 2-week history of worsening shortness of breath, cough, and two episodes of coughing up blood. She also reports ongoing, irregular vaginal spotting for the past month. Six months ago, she had an uncomplicated spontaneous vaginal delivery of a healthy term infant. She has no significant past medical history and takes no medications. Her temperature is 37.2°C (99.0°F), blood pressure is 110/70 mm Hg, pulse is 112/min, and respiratory rate is 22/min. Pulse oximetry shows 94% on room air. Lung auscultation reveals bilateral crackles. Pelvic examination demonstrates a symmetrically enlarged, soft uterus and a 2-cm, dark red, highly vascular-appearing nodule on the posterior vaginal fornix. Chest radiography displays multiple bilateral, rounded pulmonary nodules. Which of the following is the most appropriate next step in the diagnostic evaluation of this patient?

  1. A
    Excisional biopsy of the vaginal nodule
  2. B
    Sputum culture and acid-fast bacilli smear
  3. Quantitative serum β\beta-hCG measurementAnswer
  4. D
    Computed tomography pulmonary angiography
  5. E
    Office sampling of the uterine lining

Answer

The correct answer is quantitative serum β\beta-hCG measurement, which is the definitive diagnostic test for choriocarcinoma, avoiding the need for high-risk tissue biopsies.
The correct answer is quantitative serum β\beta-hCG measurement. This patient's presentation of respiratory symptoms, hemoptysis, multiple pulmonary nodules, an enlarged uterus, and a highly vascular vaginal lesion six months postpartum is highly suspicious for choriocarcinoma. Choriocarcinoma is an aggressive form of gestational trophoblastic neoplasia (GTN) that can follow any type of pregnancy, including a normal term delivery. It frequently metastasizes hematogenously to the lungs (causing 'cannonball' nodules and hemoptysis) and the vagina. The diagnosis is established by detecting a markedly elevated quantitative serum β\beta-hCG level. Tissue diagnosis is not required and is avoided due to the high risk of severe hemorrhage.

Step-by-Step Solution

1
Analyze the patient's clinical presentation and recent obstetric history.
The patient is 6 months postpartum and presents with hemoptysis, multiple pulmonary nodules, an enlarged uterus, and a vascular vaginal lesion.
Identifying the constellation of signs is critical to forming a differential diagnosis for a postpartum patient presenting with multiorgan symptoms.
2
Correlate the physical and imaging findings with the likely underlying pathology.
The combination of 'cannonball' lung metastases and a highly vascular vaginal nodule in a recently pregnant patient strongly suggests choriocarcinoma with hematogenous spread.
Choriocarcinoma is an aggressive gestational trophoblastic neoplasia that frequently metastasizes to the lungs and the vagina, often months after a normal delivery.
3
Determine the safest and most definitive diagnostic next step.
A quantitative serum β\beta-hCG level will confirm the diagnosis of a trophoblastic tumor without the need for an invasive procedure.
Biopsy of highly vascular metastatic lesions in choriocarcinoma is strictly contraindicated due to the severe risk of massive, uncontrollable hemorrhage.

Key Concept

Diagnosis and management of choriocarcinoma, emphasizing the role of beta-hCG and the contraindication of biopsying vascular metastases.
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Topics

Gynecologic Oncology

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