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1. Epithelial tumours
1.1 IDC
1.2 ILC
1.3 Tubular
1.4 Invasive cribriform
1.5 Medullary
1.6 Mucinous ca and other tumours
with abundant mucin
1.6.1 Mucinous ca
1.6.2 Cystadenocarcinoma and
col cell mucinous ca
1.6.3 Signet ring cell ca
1.7 Neuroendocrine tuomurs
1.7.1 Solid neuroendocrine ca
1.7.2 Atypical carcionid tumour
1.7.3 Small cell / oat cell ca
1.7.4 Large cell neuroendocrine
ca
1.8 Invasive papillary ca
1.9 Invasive micropapillary ca
1.10 Apocrine ca
1.11 Metaplastic carcinomas
1.11.1 Pure epithelial
metaplastic ca
1.11.1.1 Squamous cell ca
1.11.1.2 Adenoca with
spin-
dle cell metaplasia
1.11.1.3 Adenosquamous ca
1.11.1.4 Mucoepidermoid ca
1.11.2 Mixed epithlial/ mesen-
chymal metaplastic ca
1.12 Lipid-rich ca
1.13 Secretory ca
1.14 Oncocytic ca
1.15 Adenoid cystic ca
1.16 Acinic cell ca
1.17 Glycogen-rich clear cell ca
1.18 Sebaceous ca
1.19 Inflammatory ca
1.20 Lobular neoplasia
1.20.1 Lobular ca in situ
1.21 Intraductal proliferative lesions
1.21.1 Usual ductal hyperplasia
1.21.2 Flat epithelial atypia
1.21.3 Atypical ductal hyper-
plasia
1.21.4 Ductal carcinoma in situ
1.22 Microinvasive ca
1.23 Intraductal papillary neoplasms
1.23.1 Central papilloma
1.23.2 Peripheral papilloma
1.23.3 Atypical papilloma
1.23.4 Intraductal papillary car-
cinoma
1.23.5 Intracystic papillary ca
1.24 Benign epithelial proliferations
1.24.1 Adenosis including vari-
ants
1.24.1.1 Sclerosing
adenosis
1.24.1.2 Apocrine adenosis
1.24.1.3 Blunt duct adenosis
1.24.1.4 Microglandular
adenosis
1.24.1.5 Adenomyoepithelial
adenosis
1.24.2 Radial scar / complex
sclerosing lesion
1.25 Adenomas
1.25.1 Tubular adenoma
1.25.2 Lactating adenoma
1.25.3 Apocrine adenoma
1.25.4 Pleomorphic adenoma
1.25.5 Ductal adenoma
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2. Myoepithelial lesions
2.1
Myoepitheliosis
2.2
Adenomyoeithelial adenosis
2.3
Adenomyoepithelioma
2.4
Malignant myoepithelioma
3. Mesenchymal lesions
3.1 Haemangioma
3.2 Angiomatosis
3.3 Haemangiopericytoma
3.4 Pseudoangiomatous stromal
hyperplasia
3.5 Myofibroblastoma
3.6 Fibromatosis (aggressive)
3.7 Inflammatory myofibroblastic
tumour
3.8 Lipoma
3.8.1 Angiolipoma
3.9 Granular cell tumour
3.10 Neurofibroma
3.11 Schwannoma
3.12 Angiosarcoma
3.13 Liposarcoma
3.14 Rhabdomyosarcoma
3.15 Osteosarcoma
3.16 Leiomyoma
3.17 Leiomyosarcoma
4. Fibroepithelial tumours
4.1 Fibroadenoma
4.2 Phyllodes tumour
4.2.1 Benign
4.2.2 Broderline
4.2.3 Malignant
4.3 Periductal stromal sarcoma, low
grade
4.4 Mammary hamartoma
5. Tumours of the nipple
5.1 Nipple adenoma
5.2 Syringomatous adenoma
5.3 Paget disease of the nipple
6. Malignant lymphoma
6.1 Diffuse large B-cell lymphoma
6.2 Burkitt lymphoma
6.3 Extranodal marginal-zone B-cell
lymphoma of MALT type
6.4 Follicular lymphoma
7. Metastatic tumours
8. Tumours of the male breast
8.1 Gynecomastia
8.2 Carcinoma
8.2.1 Invasive
8.2.2 In situ
Adapted from WHO, Tumours of the Breast and Female
Genital Organs. IARCPress, 2003
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