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Difficulty: HardMenstrual Cycle Abnormalities and Contraception

A 3232-year-old nulliparous woman comes to the office due to heavy vaginal bleeding for the past 1414 days. She reports that since menarche at age 1212, she has only had three to four menstrual periods per year. Her weight has steadily increased since her early twenties, and she now has a body mass index of 37 kg/m237 \text{ kg/m}^2. Medical history is significant for severe acne and type 2 diabetes mellitus. She takes metformin and uses condoms for contraception. Vital signs are within normal limits. Physical examination shows dark, velvety hyperpigmentation on the posterior neck and axillae. Pelvic examination reveals active bleeding from the cervical os. Bimanual examination shows a normal-sized, mobile uterus with no adnexal masses. A point-of-care urine pregnancy test is negative. She does not desire pregnancy at this time. Which of the following is the most appropriate next step in management?

  1. Endometrial biopsyAnswer
  2. B
    Insertion of a 52-mg levonorgestrel-releasing intrauterine device
  3. C
    Measurement of serum testosterone and dehydroepiandrosterone sulfate
  4. D
    Transvaginal ultrasonography to measure endometrial thickness
  5. E
    Prescription of combined oral contraceptives

Answer

Endometrial biopsy
The correct answer is endometrial biopsy. This patient has abnormal uterine bleeding in the setting of chronic anovulation (suggested by a history of only 33 to 44 periods per year since menarche) and significant obesity. These factors lead to a continuous state of unopposed estrogen, where the endometrium proliferates without the protective, stabilizing effect of post-ovulatory progesterone. Over time, this greatly increases the risk of endometrial hyperplasia and endometrial adenocarcinoma. While endometrial biopsy is universally recommended for evaluating abnormal uterine bleeding in women ≥45\geq 45 years of age, it is equally critical for women <45< 45 years of age who possess significant risk factors for endometrial cancer, such as obesity, chronic anovulation (often due to PCOS), or diabetes mellitus. Before any hormonal therapy is initiated to treat her bleeding, tissue sampling must be performed to exclude malignancy.

Step-by-Step Solution

1
Identify the primary presentation and underlying risk factors.
The patient presents with prolonged abnormal uterine bleeding. She has a history of chronic oligo-ovulation, severe obesity (37 kg/m237 \text{ kg/m}^2), insulin resistance (acanthosis nigricans), and type 2 diabetes.
These features characterize Polycystic Ovary Syndrome (PCOS) and indicate a state of chronic, unopposed estrogen exposure.
2
Apply diagnostic guidelines for abnormal uterine bleeding (AUB).
Although she is under 4545 years of age, her significant risk factors (obesity, chronic anovulation) place her at high risk for endometrial hyperplasia or carcinoma.
Guidelines mandate endometrial evaluation for AUB in women aged ≥45\geq 45, OR in women <45< 45 who have a history of unopposed estrogen exposure, failed medical management, or Lynch syndrome.
3
Select the most appropriate diagnostic intervention.
Endometrial biopsy is the required next step.
A definitive tissue diagnosis is required to rule out malignancy before initiating any hormonal treatments designed to stop the bleeding.

Key Concept

Indications for Endometrial Biopsy in Premenopausal Women
Estimated Time:1m 30s
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Topics

Menstrual Cycle Abnormalities and Contraception

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