... mar-gins, histopatologic confirmation is the only sure differen-tial between benign and malignant disease. The differential diagnosis from cancer is the most impor-tant issue due to the very ... diagnosis. However, the two entities have substantially the same clinical and bio-logical behavior. Furthermore, differential diagnosis of a breast mass in a male routinely must distinguish fromgynecomastia, ... differen-tial diagnosis from breast cancer, but could not in differ-entiating from other mixed epithelial-mesenchymaltumors. For all these reasons, the exact diagnosis is fre-quently achieved...