Fig. 1.
Histopathologic analysis of intracerebral model of lymphomatous growth: infiltration and immunophenotype. A, intracerebral Raji lymphoma growth in brain is diffusely infiltrative into cerebral cortex, midbrain, contralateral hemisphere, and leptomeninges (H&E) and tumors exhibit the characteristic PCNSL immunophenotype. B, CD20+ membrane staining of lymphoma cells with perivascular pattern of infiltration (angiotropism; ×200). C, Bcl-6+ nuclear staining of lymphoma cells that exhibit intense meningeal spread (left; ×100). D, MUM-1+ expression by lymphoma cells (×400).