Figure 2.
Canine mammary biopsies with columnar cell hyperplasia without atypia (CCH) H&E stain. 2A Low-power view, terminal duct lobular unit with cellular stratification, more than two cell layers, 100×. 2B Higher power view; columnar cells with uniform ovoid to elongated nuclei, observed hobnail cells with nucleoli absent or inconspicuous, 600×.