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Table 1 Reporting Categories of Needle Biopsies [2]

From: Reliability and validity of needle biopsy evaluation of breast-abnormalities using the B-categorization – design and objectives of the Diagnosis Optimisation Study (DIOS)

Category Terminology Meaning
B1 Normal tissue or uninterpretable Normal or unsatisfactory biopsy which is:
1) uninterpretable because of artefact*
2) composed of stroma only*
3) composed of normal breast tissue where normal appearances are felt to be inconsistent with findings on imaging and clinical examination*
B2 Benign Usual ductal hyperplasia, sclerosing adenosis, fiboradenoma, involutionary calcification, periductal mastitis, hamartoma
B3 Benign but of uncertain biological potential Papillomas, radial scars/complex sclerosing lesions, lobular intraepithelial neoplasia (LIN), atypical epithelial proliferation of ductal type (AEDT) depending on grade and extension sometimes B4, phylloides tumor
B4 Suspicious Changes suggestive of in situ or invasive malignancy but a categorical diagnosis cannot be made because of artefact or because the appearances are borderline
B5 Malignant
a) in situ
b) invasive
c) uncertain whether in situ or invasive
d) other malignancies
Unequivocal malignant process
  1. *: indication for a second biopsy.