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The terminal duct-lobular unit is the origin of 2 distinct variants of intraepithelial neoplasia traditionally separated into ductal and lobular types based on a combination of cytologic and architectural features. In general, distinction of the fully developed or classic lobular intraepithelial neoplasia (LIN) from various grades of ductal intraepithelial neoplasia (DIN) is not a problem. An increasing...