Figure 3.

(a) Concomitant atypical ductal hyperplasia (ADH) and flat epithelial atypia (FEA). The bottom field shows FEA. The right field shows focal papillary proliferation, and the cells are cytologically identical to those of the FEA. (b) Some ducts show the characteristic features of FEA. Two spaces at the bottom show ADH with rigid bridge and cellular tufts composed of cells. (c) Atypical ductal hyperplasia is seen in the center of the field with focal cribriform pattern. The background shows FEA.