What are the histologic findings of medullary carcinoma breast cancer?

Updated: Feb 04, 2021
  • Author: Pavani Chalasani, MD, MPH; Chief Editor: John V Kiluk, MD, FACS  more...
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Medullary carcinoma is relatively uncommon (5%) and generally occurs in younger women. Most patients present with a bulky palpable mass and axillary lymphadenopathy. Diagnosis of this type of breast cancer depends on the following histologic triad:

  • Sheets of anaplastic tumor cells with scant stroma
  • Moderate or marked stromal lymphoid infiltrate
  • Histologic circumscription or a pushing border

DCIS may be observed in the surrounding normal tissues. Medullary carcinomas are typically high-grade lesions that are negative for ER, PR, and HER2 and that commonly demonstrate mutation of TP53.

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