The granulomatous tissue largely comprises foam cells of monocyte/macrophage origin positive for KP1, HAM56, CD11b and CD68. Neutrophils, hemorrhagic foci and numerous plasma cells are additional findings. Staphylococcus aureus was isolated in the case reported by Kamat et al. A delayed type hypersensitivity reaction in cell-mediated immunity has been suggested in this type of infiltrate that is composed of macrophages and T cells. T cells are represented by a mixture of CD4+ and CD8+ lymphocytes. Macrophages and lymphocytes show marked expression of HLA-DR antigen. Arguably XO is the bone localization of the<unk>  process occurring in several other locations.
Xanthogranulomatous osteomyelitis
Aneurysmal bone cyst
Metastatic calcinosis cutis
Metastatic calcification
Osteitis fibrosa cystica
Tumoral calcinosis
Zirconium granuloma
Juvenile active ossifying fibroma