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Lactating adenoma

Case contributed by Henry Knipe
Diagnosis certain

Presentation

Left breast mass. Two months post partum.

Patient Data

Age: 20-25 years
Gender: Female
ultrasound

The palpable mass correlates to a 38 x 27 x 12 mm mass with smooth margins and similar echogenicity to the adjacent breast parenchyma. No vascularity. 

Case Discussion

This patient self-detected the lump in her third trimester of pregnancy, and since breastfeeding, the lump got larger. The differential diagnosis was fibroadenoma, hamartoma and lactating adenoma.

The patient underwent an ultrasound-guided core biopsy. 

Histopathology

MACROSCOPIC DESCRIPTION: Four tan needle cores 3-14 mm. 

MICROSCOPIC DESCRIPTION: The sections show core biopsies of fibrofatty breast tissue containing benign breast lobules demonstrating lactational change. There is no evidence of dysplasia or malignancy.

CONCLUSION:
Breast, left, 5 o'clock core biopsy: Lactating adenoma (nodular lactational hyperplasia). 

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