Fig. 3
From: Histologic, immunohistochemical, and molecular features of pituicytomas and atypical pituicytomas
Histologic and Immunohistochemical features of atypical pituicytomas. Tumors showed high cellularity and noticeable atypia (a and b, arrows in a highlighting regions with atypical nuclei). Mitotic figures were present (c, arrow pointing to mitosis). Atypical pituicytomas had an elevated Ki-67 proliferation index (d). a, b and c stained with hematoxylin and eosin. a, b and d at 100x; c at 200x