[A lumbar vertebral eosinophilic granuloma with spinal instability in an adolescent]

This is a case report of a rare isolated eosinophilic granuloma of vertebra L3, in a 15-year-old adolescent. Vertebral instability, due to aggravation of the osteolysis, occurred without neurological symptoms despite orthopedic treatment. Surgery was necessary to correct and stabilize the spinal deformation. Postoperative chemotherapy (vinblastine and corticoids) was given as recommended for Langerhans cell histiocytosis (HL2010). No recurrence was observed after 5 years of follow-up.