... intraductal carcinoma,invasive carcinoma, atypical ductal hyperplasia andhyperplasia of the usual type [2-4]. Most invasive carcino-mas that arise in this setting are of the mucinous type ... Ro JY, Sneige N, Sahin AA, Silva EG, del Junco GW, Ayala AG:Mucocelelike tumor of the breast associated with atypicalductal hyperplasia or mucinous carcinoma. A clinicopatho-logic study of ... declare that they have no competing interests.Columnar cell lesions with atypia (flat epithelial atypia)Figure 3Columnar cell lesions with atypia (flat epithelial aty-pia). Hematoxylin and...