Everything that you need to know about breast microcalcifications on to the overall placements of the microcalcifications within the breast image. in single clusters or multifocal, unilateral or bilateral, diffuse, segmental, linear, or regional. Various patterns of calcifications occur in the breast; some benign, some malignant. and categorized according to the lexicon mentioned in BI-RADS (Breast Imaging . mammogram (A) and magnified view (B) show segmental calcifications.