Mammary fibromatosis is a rare entity. In Japan, only several cases have been reported. We present a case of mammary fibromatosis with a review of the Japanese literature. A 56-year-old woman was seen at the hospital because of a tumor of the left breast. The tumor measuring 6×4cm in diameter with an unclear border was palpated in the upper quadrant of the left breast with reddness and retraction of the overing skin. IN clinical, radiological and ultrasonographic examinations, it was difficult to distinguish from brest cancer. Cytologic examination was negative for malignant cells. Because we could not rule out a possible malignancy, quadrantectomy was carried out. So a diagnosis of mammary fibromatosis was made. There has not been evidence of recurrence, as of 27 months after the surgery. They are characterised by infiltrative growth and a tendency to recurrence even after resection, but they never metastasize. So follow-up should be especially vigilant.
Nihon Rinsho Geka Gakkai Zasshi (Journal of Japan Surgical Association)