title: Inclusion body fibromatosis of the breast. Two cases with immunohistochemical and ultrastructural findings.
abstract: Two cases of fibromatosis of the breast, characterized by a proliferation of spindle cells containing intracytoplasmic, spherical, eosinophilic inclusion bodies, are reported. The light and electron microscopic features, as well as the immunohistochemical features, are indistinguishable from those found in infantile digital fibromatosis. The proliferating spindle cells are characterized as myofibroblasts, whereas the inclusion bodies show an immunohistochemically nonreactive, hollow-like pattern with peripheral reactivity for actin filaments. This lesion, observed for the first time in the breast, expands the number of extradigital inclusion body fibromatoses.
authors.affiliation: Department of Pathology, University of Naples Federico II, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Pettinato
authors.forename: J C
authors.initials: JC
authors.lastname: Manivel
authors.forename: E W
authors.initials: EW
authors.lastname: Gould
authors.forename: J
authors.initials: J
authors.lastname: Albores-Saavedra
mesh_terms: D000328:Adult; D001943:Breast Neoplasms / Q000378:metabolism* / Q000648:ultrastructure*; D005260:Female; D005350:Fibroma / Q000378:metabolism* / Q000648:ultrastructure*; D006801:Humans; D007150:Immunohistochemistry; D002479:Inclusion Bodies / Q000648:ultrastructure*; D008854:Microscopy, Electron; D008875:Middle Aged