Figure 2.

Wistar rat (no. 24) that received C6-ICLC glioma cells. (A) Transverse and (B) dorsal T2-weighted MR images on day 20 reveal a 20-mm³ hyperintense mass along the needle tract (A-B, circles). (C) Transverse and (D) dorsal T2-weighted MR images on day 30 show that the mass has disappeared; the needle tract is still identifiable on the dorsal image. (E and F) Tumor regression is characterized by inflammatory foci, rare lymphocytes, and neovascular proliferation. Hematoxylin and eosin stain; bar, 100 µm.