NCIt definition : A benign breast lesion characterized by the presence of fibrosis with stellate appearance
in the parenchyma. The lesions are often multiple and bilateral. Grossly, the lesions
are irregular and firm and resemble carcinoma. Microscopically, the stellate lesions
are composed of dense, hyalinized collagen. Entrapped in the collagen are tubules.
There is no evidence of cytologic atypia.;