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Difficulty: MediumBreast Disorders

A 26-year-old nulligravid woman comes to the clinic because she found a lump in her left breast 1 week ago. She is premenopausal with regular 28-day menstrual cycles, and her last menstrual period was 10 days ago. She is currently not pregnant and is not lactating. She has no significant past medical history, and her family history is negative for breast or ovarian cancer. On physical examination, her vital signs are within normal limits. Breast examination reveals a 2.5-cm, firm, mobile, well-circumscribed, and non-tender mass in the upper outer quadrant of the left breast. There is no overlying skin dimpling, erythema, or nipple discharge. There is no palpable axillary or supraclavicular lymphadenopathy. Which of the following is the most appropriate next step in evaluation?

  1. A
    Diagnostic mammography of the left breast
  2. B
    Core needle biopsy of the mass
  3. Targeted ultrasound of the left breastAnswer
  4. D
    Reassurance and repeat clinical examination in 1 month
  5. E
    Magnetic resonance imaging of the breast

Answer

Targeted ultrasound of the left breast is the most appropriate next step.
The correct answer is targeted ultrasound of the left breast. In the clinical evaluation of a newly palpable breast mass, the patient's age dictates the initial imaging modality. For women under 30 years old, ultrasound is the first-line choice because their breast tissue is typically radiographically dense, which can obscure masses on mammography. Ultrasound can accurately differentiate between a simple cyst and a solid mass (e.g., fibroadenoma) and does not expose the patient to unnecessary ionizing radiation.

Step-by-Step Solution

1
Identify the patient's demographic risk factors and clinical presentation.
The patient is a 26-year-old female presenting with a newly palpable, discrete breast mass that is firm and mobile, characteristic of a benign lesion such as a fibroadenoma.
Patient age is the primary determinant for the initial imaging algorithm in evaluating a new breast mass.
2
Apply the standard age-based clinical guideline for breast mass evaluation.
For patients under 30 years of age, targeted ultrasound is the preferred initial imaging test.
Younger women have dense breast tissue that limits the diagnostic utility of mammography. Ultrasound effectively characterizes the mass (cystic versus solid) without ionizing radiation.

Key Concept

In evaluating a palpable breast mass in a woman under 30 years of age, targeted ultrasound is the first-line imaging modality due to dense breast tissue limiting the utility of mammography.
Estimated Time:1m 0s
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Topics

Breast Disorders

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