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Rosai.Atypical ductal hyperplasia (ADH), atypical lobular hyperplasia (ALH) and flat epithelial atypia (FEA) are common lesions mainly detected during mammographic screening. They are considered lesions at risk for the development of breast cancer, and they have been documented as non-obligate precursors of low grade in situ carcinomas. In a monumental work in 1991 Rosai gathered them as "borderline epithelial lesions", and he described and demonstrated the subjectivity in their microscopic interpretation. Such subjectivity persists nowadays and l