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Solitary eosinophilic granuloma of the bone has been described in almost every bone of the body. It is more common in children than adults. The disease had been variously described among the xanthomatoses and Osteomyelilis, but Lichtenstein and Jaffe (1940) described it as a separate entity and suggested the name eosinophilic granuloma. Otani and Ehrlich (1940) named it as Solitary Granuloma of the Bone. Faber (1941) suggested a pathological gradation to include eosinophilic granuloma, Hand-Schuller-Christian disease, and Letterer Siwe disease. For these the title Histiocytosis X was coined by Lichtenstein in 1953. He suggested that eosinophilic granuloma is a localized form. Letterer Siwe and Hand-Schuller-Christian disease are considered as the acute and disseminated forms. Tow cases of solitary eosinophilic granuloma of the bone are presented here.