Benign

Atypical

Malignant

Type 1

Fibroadenomatoid hyperplasia

Flat epithelial atypia

Type 2

Fibrocystic change

Apocrine metaplasia

Intraductal papilloma

Intracystic papilloma

Atypical ductal hyperplasia

Papillary carcinoma

Type 3

Breast abscess

Fat necrosis

Post-operative seroma

Adenomyoepithelioma

Papillary DCIS

Type 4

Breast abscess

Granulomatous mastitis

Galactocoele

Lymphangioma

Foreign body granuloma

Myxoid fibroadenoma

Benign phyllodes

Invasive ductal carcinoma

Invasive mucinous carcinoma

DCIS

Encysted papillary carcinoma

Malignant phyllodes

Metaplastic breast carcinoma

Angiosarcoma