the eosinophilic granuloma is part of the histiocytosis x classification , having a common histological substratum , the granuloma , which is characterized by a proliferation of histiocytes ( reticulo-endothelial cells ) and a cytoplasmic inclusion body ( the x body ) whose etiopathogenic significance is not yet established .
C0014461
eosinophilic granuloma
C0019621
histiocytosis x