Differential diagnosis:
The most apparent differential diagnosis is scirrhous carcinoma. Some other differentials are granulomatous mastitis, fat necrosis, duct ectasia, myoblastoma, epithelial cells with apocrine features, dermoid cyst, desmoid tumor, duct ectasia, sclerosing adenosis, fibroadenoma, hidradenoma, hypertrophic scar, traumatic neuroma, keloid, lipoma, invasive mammary carcinoma, secretory malignancies, alveolar variant of ductal malignancy, histiocytic malignancy, apocrine carcinoma, basal cell carcinoma, fibrosarcoma, malignant fibrous histiocytoma, neurofibroma and schwannoma [11]. Although extensive, correct diagnosis can be achieved combining a careful histologic, immunohistochemical, imaging and clinical evaluation.