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Difficulty: MediumBreast and Endocrine Surgery

A 3232-year-old woman, gravida 22, para 11, at 1818 weeks gestation presents to the clinic after noticing a new mass in her right breast 22 weeks ago. She reports no breast pain, skin changes, or nipple discharge. She has no personal or family history of breast cancer. Vital signs are within normal limits. Physical examination reveals a 33-cm, firm, non-tender, and relatively fixed mass in the upper outer quadrant of the right breast. There is no overlying erythema, warmth, or peau d'orange. Palpation of the right axilla reveals a firm, mobile 1.51.5-cm lymph node. The left breast and axilla are normal. Which of the following is the most appropriate next step in the evaluation of this patient's breast mass?

  1. Targeted ultrasound of the right breast and axillaAnswer
  2. B
    Diagnostic mammography with abdominal shielding
  3. C
    Reassurance and reevaluation 66 weeks postpartum
  4. D
    Empiric therapy with oral dicloxacillin for 77 days
  5. E
    Measurement of serum thyroid-stimulating hormone and prolactin levels

Answer

The most appropriate next step is a targeted ultrasound of the right breast and axilla.
The correct answer is a targeted ultrasound of the right breast and axilla. Breast cancer during pregnancy is rare but can occur, and any dominant, firm, or fixed mass requires prompt evaluation. The physiologic hypertrophy and increased glandular density of the breast during pregnancy and lactation significantly reduce the sensitivity and predictive value of mammography. Therefore, ultrasound is the preferred initial imaging modality. It is highly sensitive, avoids ionizing radiation exposure to the fetus, and can effectively distinguish between simple cysts (e.g., galactoceles) and complex or solid masses. If the ultrasound is suspicious for malignancy, a core needle biopsy is the subsequent definitive step.

Step-by-Step Solution

1
Identify the primary clinical problem from the vignette.
The patient has a new, 33-cm, firm, fixed breast mass with ipsilateral axillary lymphadenopathy at 1818 weeks gestation.
Establishing the severity and characteristics of the clinical finding dictates the urgency of the workup.
2
Determine the appropriate diagnostic algorithm for a breast mass in pregnancy.
Initial evaluation requires an imaging modality that is safe for the fetus and highly sensitive in the setting of dense breast tissue.
Pregnancy induces physiologic breast hypertrophy, altering the diagnostic utility of standard imaging like mammography.
3
Select the optimal initial imaging modality.
Targeted ultrasound of the breast and axilla is selected as the first step.
Ultrasound provides excellent characterization of solid versus cystic masses in dense breasts without exposing the fetus to ionizing radiation.

Key Concept

The initial imaging modality of choice for a palpable breast mass during pregnancy or lactation is a targeted ultrasound.
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Topics

Breast and Endocrine Surgery

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