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.