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Cellular origin / Differentiation |
| Hyperplasia, Functional, without atypia | Hyperplasia | Alveolar /Ductal |
| Acinar Hyperplasia, Low Grade, Focal, Non-GEM | Hyperplastic alveolar nodule (HAN) | Alveolar |
| Solid Hyperplasia, Low Grade, Focal, Hormone-induced, Non-GEM | Plaque/organoid/pregnancy-dependent "tumor" (Type P) | Ductal |
| Mammary Intra-epithelial Neoplasia (MIN) | No reports | Alveolar /Ductal |
| Adenoma/Carcinoma* | Adenocarcinoma | Alveolar |
| Glandular/Acinar | Type A | Alveolar |
| Cribriform | Type AB/Type B/Type L | Alveolar |
| Papillary | Type B/Type Y | Alveolar |
| Solid | Type B/Type P | Alveolar/Ductal |
| Adenosquamous | Adenoacanthoma/Pale cell tumor/Large cell tumor/Adenosquamous carcinoma | Alveolar |
| Fibroadenoma | No reports | |
| Squamous carcinoma | Molluscoid tumor/Intraductal squamous carcinoma | Ductal |
| Adenomyoepithelioma benign/malignant | Adenocarcinoma type C/Carcinosarcoma/Mixed tumor/Adenomyoepithelioma |
Alveolar and/or ductal, myoepithelial possibly with cartilage or bone |
| Not otherwise specified (NOS) | No reports | Unknown |
* alveolar or ductal origin/differentiation