Inflammatory myofibroblastic tumor
Myofibroblastic tumour of the breast is a usually benign lesion characterized by differentiated myofibroblastic spindle cells and a chronic inflammatory infiltrate composed of lymphocytes, plasma cells and histiocytes. The tumour typically presents as a palpable, firm, circumscribed mass.
Mammary myofibroblastic tumour is rare, with only few reported cases. Complete surgical excision appears to be adequate in most cases
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IARC Press: Lyon 2003