<prompt> Shepherds crook deformity of the proximal femur seen inFibrous dysplasiaChondroblastomaOsteochondromaAneurysmal bonecyst  <response>: Fibrous dysplasia 227-M 174-75-Abley 8thFIBROUS DYSPLASIA is a developmental disorder in which areas of trabecular bone are replaced by cellular Fibrous tissue containing flecks of osteoid and woven bone Occasionally the bone disorders is associated with cafe-au-lait patches on the skin and in girls precocious sexual development Albrights syndrome Malignant transformation to fibrosarcoma occurs in 5-10 of patients with polystotic lesions, but only rarely in monostotic lesionsX ray shows radiolucent cystic areas in the metaphysis or shaft because they contain fibrous tissue with diffuse spots of immature bone, the lucent patches typically have a slightly hazy or ground glass appearanceThe weight bearing bones may be bent and one of the classic features is the shepherds crook deformity of the proximal femur 