302 The abnormal mammogram

Question 1

What are the breast biopsy diagnosis categories?

Answer 1

B1: normal breast tissue/no lesion
B2: benign lesions Eg, fibroadenoma
B3: atypia, exclude something worse
B4: atypia, likely malignant
B5a: intraepithelial neoplasia, no lymph node biopsy necessary
B5b: invasive neoplasm, excision and lymph node biopsy necessary