I. Epithelial tumors
1 Infiltrative ductal carcinoma (non-specific)
1.1 Mixed type carcinoma
1.2 Polymorphic carcinoma
1.3 Carcinoma with osteoblastic giant cells
1.4 Carcinoma with choriocarcinoma features
1.5 Carcinoma with melanotic features
2 Infiltrating lobular carcinoma
3 Small tubular carcinoma
4 Infiltrating sieve carcinoma
5 Medullary carcinoma
6 Mucin producing carcinoma
6.1 Mucinous carcinoma
6.2 Cystic adenocarcinoma and columnar cell mucinous carcinoma
6.3 Indolent cell carcinoma
7 Neuroendocrine tumors
7.1 Solid neuroendocrine carcinoma
7.2 Atypical carcinoid tumors
7.3 Small cell/oat cell carcinoma
7.4 Large cell neuroendocrine carcinoma
8 Infiltrating papillary carcinoma
9 Infiltrating micropapillary carcinoma
10 Large sweat cell carcinoma
11 Carcinoma of chemosis
11.1 Pure epithelial carcinoma
Squamous cell carcinoma
Adenocarcinoma with spindle cell metaplasia
Adenosquamous carcinoma
Mucinous epidermoid carcinoma
11.2 Mixed epithelial/mesenchymal metaplastic carcinoma
12 Lipid-rich carcinoma
13 Secretory carcinoma
14 Eosinophilic carcinoma
15 Adenoid cystic carcinoma
16 Alveolar cell carcinoma
17 Glycogen-rich clear cell carcinoma
18 Sebaceous gland carcinoma
19 Inflammatory carcinoma
20 Lobular neoplasia
20.1 Lobular carcinoma in situ
21 Intraductal proliferative lesions
21.1 Common ductal hyperplasia
21.2 Flat epithelial atypical hyperplasia
21.3 Atypical ductal hyperplasia
21.4 Ductal carcinoma in situ
22 Microinvasive carcinoma
23 Intraductal papillary tumors
23.1 Central papillary tumor
23.2 Peripheral papilloma
23.3 Atypical papilloma
23.4 Intraductal papillary carcinoma
23.5 Intracapsular papillary carcinoma
24 Benign epithelial hyperplasia
24.1 Adenopathy and its subtypes
Sclerosing adenopathy
Sweat gland adenopathy
Blind duct adenopathy
microglandular adenopathy
adenomyelinating adenopathy
24.2 Radiation scarring/complex sclerosing lesions
24.3 Adenomas
Tubular adenoma
Lactating adenoma
Sweat adenoma
Polymorphic adenoma
Ductal adenoma
II. Myoepithelial lesions
1 Myoepithelial hyperplasia
2 Myoepithelial adenopathy
3 Adenomyositic epithelial tumor
4 Malignant myoepithelial tumor
Mesenchymal tumors
1 Hemangioma
2 Angiomatosis
3 Perivascular cell tumor
4 Pseudoangioma-like mesenchymal hyperplasia
5 Myofibroblastoma
6 Fibromatosis (aggressive)
7 Inflammatory myofibroblastoma
8 Lipomas
8.1 Angiomyolipoma
9 Granulosa cell tumor
10 Neurofibroma
11 Schwann cell tumor (nerve sheath tumor)
12 Angiosarcoma
13 Liposarcoma
14 Rhabdomyosarcoma
15 Osteosarcoma
16 Smooth muscle tumor
17 Smooth muscle sarcoma
Fibroepithelial tumors
1 Fibroadenoma
2 Foliar tumor
2.1 Benign
2.2 Cross-border
2.3 Malignant
3 Periductal mesenchymal sarcoma, low grade
4 Malformation tumor of the breast
V. Nipple tumor
1 Papillary adenoma
2 Sweat duct-like adenoma
3 Paget’s disease of the nipple
Malignant lymphoma
1 Diffuse large B-cell lymphoma
2 Burkitt’s lymphoma
3 MALT-type B-cell lymphoma in the extra-nodal marginal zone
4 Follicular lymphoma
Metastatic tumors
Male breast tumor
1 Male mammary gland development
2 Carcinoma
2.1 Infiltrative carcinoma
2.2 Carcinoma in situ