Fine needle aspiration cytology presentation of bilateral mammary fibromatosis. Report of a case.

A case of bilateral fibromatosis of the breast occurring in a 22-year-old woman is described. The cytologic findings in fine needle aspirates included numerous stromal cells of the fibroblastic type, without atypia, in a background of granular amorphous material. Small fragments of collagen were present. Clusters of benign epithelial cells were occasionally observed.