Fig. 1

A-10X & B-40X: large, atypical cells within alveolar septae and vessels, (C-10X): high proliferation rate based on ki67, (D-10): atypical cells positive for PAX-5, (E-40X) CD34 highlights the endothelial cells of the blood vessels where most of atypical cells are detected. Some atypical cells are detected extravascular