[Fibroblastic and myofibroblastic lesions of the breast--clinical and morphological aspects].

Fibroblastic and myofibroblastic lesions are challenging because they occur infrequently and there is significant clinical, radiologic and morphologic overlap between reactive and neoplastic lesions, as with non-fibrous lesions. In this article we describe and discuss four particular entities in some detail: fibromatosis of the breast, nodular fasciitis, pseudoangiomatous stromal hyperplasia of the breast and one case of mammary type myofibroblastoma.