Table 1 The B-Classification and the histologic expression
Classification | Definition |
|---|---|
B1 normal | Normal or not interpretable tissue - benign parenchyma with or without minimal changes - artifacts, bleeding |
B2 Benign | Benign Lesion - fibrocystic changes - fibro adenoma - sclerosing adenosis -ectasia, abscess, fat tissue necrosis - small intraductal papilloma |
B3 benign, but with increased risk of malignancy or an association with a malignant tumor | Lesion with uncertain malignant potential - large or multiple papillary lesions with or without atypia - scar, complex sclerosing lesion - lobular intraepithelial neoplasia (LIN) - ADH - phylloid tumor or unclear fibroepithelial tumor |
B4 suspect | Suspect for malignancy |
B5 malignant | Malignant Lesions a) ductal Carcinoma in situ (DCIS) LIN (CLIS) of pleomorphic subtype G3 LIN with comedo necrosis b) Carcinoma c) status of invasion not decidable d) other malignant tumor such as Lymphoma, metastasis or sarcoma |