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Figure 5 High-resolution micro-CT cross-sectional images from normal (A) and balloon-injured (B) porcine coronary arteries (voxel size, 21 µm). Vasa vasorum are present in the outer region of the vessel wall. Note the thickened vessel wall and significant angiogenesis 28 d after balloon injury. A distinct lower x-ray density within the main lumen indicates neointimal tissue. No neovascularization is present in the neointima itself. First-order vasa vasorum are indicated by arrows and second-order vasa vasorum by triangle.