Figure 2
From: Interobserver reproducibility in the diagnosis of flat epithelial atypia of the breast
Columnar cell hyperplasia. (a) A dilated terminal duct lobular unit is evident at low power. (b) High power reveals stratification of the columnar cells with formation of small tufts. As in columnar cell change the cells are ovoid in shape, and although stratified, retain a perpendicular orientation to the basement membrane.
