Digital Atlas of Breast Pathology by Meenakshi Singh, MD - Department of Pathology, Stony Brook University Medical Center

Collagen Plug Inside Biopsy Cavity, Low Power.
A collagen plug (arrow) placed inside biopsy cavity at the time of procedure should not be mistaken as an area of necrosis (low power). Collagen plugs are intended to mark the biopsy site in case future localization is necessary.

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