The typical presentation is a painless mass located superficially in the breast, accompanied by retraction or dimpling of the skin due to fibrous scar tissue extending into the adjacent tissue. They are firm to hard, fixed and irregular by palpation. A history of trauma may be elicited. Mammographic examination reveals a spiculated, often poorly defined mass lesion that may contain punctate or irregular calcifications. The lesion consists of yellow gray and focally red mass, which may contain foci of cystic degeneration filled with oily fluid or necrotic fat.
Dystrophic calcification is a common feature.
Histologically, there is disruption of adipocytes and hemorrhage. This is followed by infiltration with histiocytes including multinucleated giant cells, variable number of lymphocytes and plasma cells, hemosiderin deposition, and marked fibrosis. Fat necrosis showing types of inflammatory cells present and fibrosis. High power view showing mulinucleate giant cells. The lesion is completely benign.