Fibromatosis of the female breast is rare. We dealt with a recurrent c
ase of fibromatosis four months after a wide excision of the tumor. It
was difficult to differentiate the tumor from carcinoma and only a pa
thological examination could lead to the final diagnosis. Ultrasonogra
phic findings are so characteristic that we would like to emphasize th
e usefulness of ultrasonography not only in distinguishing between rec
urrence and operative scar but also in defining the diagnosis as fibro
matosis of the breast.