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Difficulty: Very hardBreast Disorders

A 42-year-old woman comes to the general surgery clinic for evaluation of a left breast mass that she noticed 3 months ago. She reports that the lump has been growing rapidly during this time. The patient has no personal or family history of breast or ovarian cancer. Physical examination reveals a 5.5-cm, firm, mobile, well-circumscribed mass in the upper outer quadrant of the left breast. The overlying skin appears stretched and shiny with prominent superficial veins, but there is no skin dimpling, nipple retraction, or erythema. Axillary examination shows no palpable lymphadenopathy. Diagnostic mammography and targeted ultrasound demonstrate a large, lobulated, hypoechoic solid mass with internal cleft-like cystic spaces. An image-guided core needle biopsy is performed. Histopathology reveals a cellular fibroepithelial lesion with leaf-like architectural patterns and a hypercellular stroma with moderate atypia, consistent with a borderline phyllodes tumor. Which of the following is the most appropriate next step in management?

  1. Wide local excision with at least 1-cm marginsAnswer
  2. B
    Wide local excision with sentinel lymph node biopsy
  3. C
    Simple mastectomy with axillary lymph node dissection
  4. D
    Surgical enucleation of the mass
  5. E
    Neoadjuvant chemotherapy followed by wide local excision

Answer

Wide local excision with at least 1-cm margins
The most appropriate next step in management is wide local excision with at least 1-cm margins. Phyllodes tumors are rare fibroepithelial tumors characterized histologically by leaf-like stromal projections and increased stromal cellularity. Regardless of whether they are classified as benign, borderline, or malignant, the standard of care is complete surgical excision. Because they have a significant propensity for local recurrence, achieving wide negative margins (typically 1 cm or more) is mandatory. Crucially, phyllodes tumors arise from the breast stroma and behave analogously to sarcomas, meaning their primary route of metastasis is hematogenous (most frequently to the lungs) rather than lymphatic. Therefore, routine axillary staging procedures, such as sentinel lymph node biopsy, are not recommended for clinically node-negative patients.

Step-by-Step Solution

1
Identify the diagnosis from the provided core needle biopsy histopathology.
The presence of a fibroepithelial lesion with a leaf-like architecture and hypercellular stroma confirms a borderline phyllodes tumor.
Accurate pathologic classification is essential to distinguish the mass from a benign fibroadenoma or an invasive adenocarcinoma.
2
Determine the required surgical approach for the primary tumor.
Phyllodes tumors have a high propensity for local recurrence; therefore, they must be excised with wide negative margins of at least 1 cm. Enucleation is contraindicated.
Unlike fibroadenomas, incomplete excision of a phyllodes tumor often leads to aggressive local regrowth.
3
Evaluate the indication for regional axillary lymph node staging.
Sentinel lymph node biopsy or axillary dissection should not be performed.
Phyllodes tumors arise from the breast stroma and behave as sarcomas. Malignant or borderline variants spread hematogenously (typically to the lungs) rather than via the lymphatic system, rendering routine lymphatic staging unnecessary.

Key Concept

Phyllodes tumors are fibroepithelial breast tumors that require complete surgical resection via wide local excision with at least 1-cm margins. Because they behave like sarcomas and spread hematogenously, routine axillary lymph node staging is not indicated.
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Topics

Breast Disorders

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