Figure 4.

Comparison of meningioma and osteosarcoma components of the tumor. Meningioma was immunoreactive for EMA (a), with none to scant reticulin (b), and low proliferative activity with few Ki-67 positive nuclei (c). Osteosarcoma was non-immunoreactive for EMA (x), with prominent reticulin around single cells and small groups of cells (y), and high proliferative activity with numerous Ki-67 positive nuclei (z).