**5.3 Immunohistochemical findings**

Immunophenotyping of infiltrates allowed a better characterization of the cells participating in the inflammatory infiltrates, mainly macrophages (CD68+) and lymphocytes (CD45R+). In our works 26.5% percent of them were T lymphocytes (CD45R+, CD45R0+) and 10.5% were B lymphocytes (CD20+, light chains kappa and/or lambda+) (Figure 6A). Thirty percent of the infiltrate was composed of macrophages (CD68+). The remaining infiltrate was composed of mononuclear cells resembling macrophages and CLA-negative mononuclear cells. Contacts between CD68 positive cells and T lymphocytes were frequently found (Figure 6B). CD31 antibodies clearly pointed out normal endothelial cells, in either normal or damaged vessels (Figure 6C) (Milei, et al., 1996a).
