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. 2007 Sep 25;4:9. doi: 10.1186/1743-8454-4-9

Figure 4.

Figure 4

Photomicrographs showing effects of ethylene vinyl alcohol copolymer (Onyx) injection. At low magnification (A; H&E stain), the black tantalum granules in the polymer matrix are obvious in the fourth ventricle (arrow). By 2d (B; H&E stain) multinucleate (foreign body reaction) giant cells are apparent (arrow) adjacent to the Onyx. By 14d (C; H&E stain) the giant cell and fibroblastic reaction is more advanced, surrounding the Onyx clusters. There is associated collagen (green material, arrow) deposition as early as 5d (D; Masson's trichrome stain). Scale Bar (shown in frame D) is 50 μm for B and D, 100 μm for C, and 1600 μm for A.