Histiocytosis-X has several mode of presentation, from the mildest solitary eosinophilic granuloma of bone to the most severe, with multiple granulomata in bones and soft tissues. This disease previously described as eosinophilic granuloma, Hand-Schuller-Christian disease and Letterer-Siwe disease. Lichtenstein (1953) used the term histiocytosis-x to encompass the above three names. We experienced a case of histiocytosis-x which had occured at multiple site of bones. The patient has good general condition with complete subsidance of specific symtoms and signs in our thirty-eight months follow up treatment.