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Difficulty: MediumMenstrual Cycle Abnormalities and Contraception

A 51-year-old woman comes to the office due to a 4-day history of spotting and light vaginal bleeding. She reached menopause at age 49 and has not had any vaginal bleeding since then. Her past medical history includes obesity, type 2 diabetes mellitus, and hypertension. Current medications are metformin, lisinopril, and amlodipine. She does not use tobacco or alcohol. Vital signs show a blood pressure of 142/88 mm Hg, a pulse of 76/min, and a BMI of 34 kg/m². Pelvic examination reveals normal external genitalia and a small amount of dark red blood in the vaginal vault. The cervix appears grossly normal without any visible lesions. A urine pregnancy test is negative. A transvaginal ultrasound is performed and shows an endometrial stripe thickness of 7 mm. Which of the following is the most appropriate next step in the management of this patient?

  1. Endometrial biopsyAnswer
  2. B
    Reassurance and repeat transvaginal ultrasound in 6 months
  3. C
    Measurement of serum thyroid-stimulating hormone
  4. D
    Initiation of combined oral contraceptive pills
  5. E
    Application of topical vaginal estrogen

Answer

Endometrial biopsy
The correct action is to perform an endometrial biopsy. Any episode of postmenopausal bleeding is considered abnormal and carries an approximate 10% risk of underlying endometrial cancer. The standard initial evaluation involves a transvaginal ultrasound (TVUS). In a postmenopausal patient, an endometrial stripe thickness of greater than 4 mm is highly suspicious for endometrial hyperplasia or carcinoma, particularly in a patient with unopposed estrogen risk factors such as obesity and type 2 diabetes mellitus. Therefore, a histologic evaluation via an endometrial biopsy is mandatory to rule out malignancy.

Step-by-Step Solution

1
Identify the patient's menopausal status and presenting symptom.
A 51-year-old postmenopausal woman presents with new-onset vaginal bleeding.
Postmenopausal bleeding is a cardinal sign of endometrial cancer and must always be thoroughly investigated.
2
Evaluate the initial diagnostic test results and risk factors.
The patient has significant risk factors (obesity, diabetes) and a transvaginal ultrasound showing an endometrial thickness of 7 mm.
Transvaginal ultrasound is the first-line imaging modality to stratify the risk of malignancy in postmenopausal bleeding.
3
Determine the next indicated step based on imaging findings.
An endometrial biopsy is required.
An endometrial thickness greater than 4 mm is abnormal and necessitates histologic evaluation to definitively rule out endometrial hyperplasia or carcinoma.

Key Concept

Evaluation of postmenopausal bleeding with an endometrial stripe > 4 mm requires an immediate endometrial biopsy to rule out endometrial carcinoma.
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Topics

Menstrual Cycle Abnormalities and Contraception

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