Figure 2.

(a) Atypical ductal hyperplasia (ADH) characterized by complex architectural atypia (formation of bridges rigid bars, and micropapillary projections within the each single duct. (b) The qualitative features in the duct are similar those of low‐grade ductal carcinoma in situ (DCIS), but the lesion is limited in extent and small (<2 mm) (c) The uniform, atypical cell population involves only a portion of the single duct. (d) The arcade formation is partially seen, which is relatively round and evenly spaced consisting of monotonous cells.