Fig. 8
From: Low-grade myofibroblastic sarcoma arising in fibroadenoma of the breast-A case report–
Immunohistochemical staining profiles favoring a myofibroblastic cell origin. a Diffuse fibronectin-immunoreactivity is found in the tumor cell cytoplasms (Diaminobenzidine, ×400). b Most tumor cell cytoplasms are immunoreactive for α-smooth muscle actin (Diaminobenzidine, ×400). c There is a diffuse nuclear immunopositivity for calponin, a myofibroblastic differentiation marker (Diaminobenzidine, ×200). d Vimentin, a general mesenchymal marker is immunostained strongly in most tumor cells (Diaminobenzidine, ×400)