RT Journal Article SR Electronic T1 Unusual location of eosinophilic granuloma JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 1489 OP 1491 VO 25 IS 10 A1 Haouimi, Ammar S. A1 Al-Hawsawi, Zakaria M. A1 Jameel, Ahmed N. YR 2004 UL http://smj.org.sa/content/25/10/1489.abstract AB Eosinophilic granuloma EG is a benign self-limiting disease, which belongs to the spectrum of Langerhans' cell histiocytosis LCH. The etiology of LCH remains unknown, although the evidence indicates that it is a clonal proliferative disorder of Langerhans cells, it has also been characterized as reactive disorder, neoplastic process and a berrant immune response. Eosinophilic granuloma is characterized by single or multiple skeletal lesions occurring predominately in children, adolescents and young adults, it accounts for 70% of LCH. It is more common in males, and the common sites are the skull, mandible, ribs, spines and long bones particularly the femur and the humerus. The estimated incidence of EG is 3-4 per million of the population. Vertebral bone involvement is rarely seen and usually affects the vertebral body. We are reporting an unusual case of EG in a female child presented with a solitary lesion at posterior element of lumbar vertebra.