Figure 2. The peripheral compressing artifacts (arrows). Semi-circular (A, B, C) or band-like (D, E, F) tissue compression are observed (A, C, D, E: H&E × 100). The compressing artifacts are accentuated by the GFAP immunohistochemical staining (B: GFAP × 200, F: GFAP × 100). The opposite side (arrow heads) of the artifact does not show the compressing artifact (A, D, E, F). A, B and C are gliomas. D is primary central nervous system lymphoma. E and F are non-neoplastic glial tissues.