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Question

Difficulty: MediumBreast Disorders

A 48-year-old woman comes to the clinic due to a 3-week history of right breast swelling, redness, and heaviness. She is not pregnant and has not lactated in over 15 years. Two weeks ago, she was evaluated at an urgent care clinic for these symptoms, diagnosed with mastitis, and prescribed a 10-day course of oral cephalexin. She completed the antibiotics, but her symptoms have progressively worsened. Her temperature is 37.1°C (98.8°F). Physical examination of the right breast reveals diffuse erythema and significant edema over 60% of the breast surface. The skin has a thickened, pitted appearance resembling an orange peel. Palpation reveals generalized firmness without a discrete, fluctuant mass. There is palpable, firm right axillary lymphadenopathy. Which of the following is the most appropriate next step in management?

  1. Diagnostic imaging and core needle biopsyAnswer
  2. B
    Admission for intravenous broad-spectrum antibiotics
  3. C
    Bedside ultrasound-guided incision and drainage
  4. D
    Measurement of serum prolactin and thyroid-stimulating hormone
  5. E
    Reassurance and repeat clinical breast examination in 4 weeks

Answer

Diagnostic imaging and core needle biopsy
The correct answer identifies the need for urgent diagnostic workup. This patient's presentation of rapid-onset breast erythema, edema, and peau d'orange (pitted, orange-peel appearance of the skin) that fails to improve with a standard course of antibiotics is highly suspicious for inflammatory breast cancer (IBC). IBC is an aggressive form of primary breast carcinoma characterized by tumor emboli obstructing dermal lymphatic channels, which causes the classic edematous skin changes. When a non-lactating woman presents with symptoms of mastitis that do not resolve with appropriate antibiotic therapy, malignancy must be immediately ruled out. The most appropriate next step is diagnostic imaging (mammography and ultrasound) followed promptly by a core needle biopsy of the breast parenchyma and often a punch biopsy of the affected skin.

Step-by-Step Solution

1
Analyze the patient's demographic and clinical presentation.
A 48-year-old non-lactating woman presents with unilateral breast erythema, edema, and 'peau d'orange' skin changes.
Identifying the patient's age and lactational status helps differentiate between infectious mastitis (common in lactation) and other etiologies.
2
Evaluate the response to prior therapy.
The symptoms worsened despite a full 10-day course of appropriate oral antibiotics (cephalexin).
Failure to improve on antibiotics for presumed mastitis in a non-lactating woman is a classic red flag for underlying malignancy.
3
Identify the most likely diagnosis based on the physical exam findings.
The presence of peau d'orange and axillary lymphadenopathy points to Inflammatory Breast Cancer (IBC).
IBC causes dermal lymphatic obstruction by tumor emboli, leading to the characteristic pitted skin edema.
4
Determine the next best step in management for suspected Inflammatory Breast Cancer.
Diagnostic imaging (mammography and ultrasound) followed by core needle biopsy of the breast and a skin punch biopsy.
Histological confirmation is urgently required to diagnose IBC and initiate neoadjuvant chemotherapy.

Key Concept

Any non-lactating woman presenting with symptoms of mastitis that do not resolve with a standard course of antibiotics must be urgently evaluated for Inflammatory Breast Cancer using imaging and biopsy.
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Topics

Breast Disorders

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