Under microscope, the cellular infiltrate includes neutrophils, lymphocytes, plasma cells, erythrocytes, hemosiderin-laden macrophages and prevalent foamy histiocytes.The latter are interspersed among other cells but often they cluster in a compacted mosaic-like pattern. The large lipid-laden macrophages display an eosinophilic or clear cytoplasm with a granular and vacuolated quality but can also have a spindle shape. Foreign body-type and Touton-type giant cells, calcospherites, cholesterol clefts and hemosiderin deposits are additional findings.