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Polyostotic fibrous dysplasia is a skeletal disorder of unknown aetiology appearing at puberty and is characterized by the involvement of the diaphysis of multiple long bones usually on one side of the body, bending of the weight bearing bones and occasionally, growth disturbances. Histologically, it is recognized by the presence of fibro-osseous tissue in the affected part of the bone. In females, this disorder may sometimes be associated with precocious puberty and abnormal pigmentation of the skin. The tendency of this disorder to involve predominantly one side of the body may perhaps be due to some developmental defect (Jaffe 1958). Occasionally only one bone may be involved when it is called monostotic fibrous dysplasia. In both the types, involvements of the bones of hands and feet is rare. A case of monostotic fibrous dysplasia of calcaneum is being reported in view of the rarity of this lesion at this site.