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Langerhans cell histiocytosis is a non-malignant proliferative disease of unknown etiology that can affect one or more organs. This is a rare disease, 1 to 2/100,000, affecting mainly children with a male predominance. The osseous lesions are the most frequent (60 to 90%). There is however no consensus treatment for the management of these sites. We report the cases of two patients successfully treated with radiotherapy after primary chemotherapy, at doses of 15 Gy in ten sessions of 1.5 Gy for one patient and 18 Gy in ten fractions of 1.8 Gy for the other. Single or multifocal bone Langerhans cell histiocytosis without visceral involvement is a benign, self-limiting affection in most cases. Some bone lesions could be treated by radiotherapy alone. But the high variability of doses currently given in the literature does not allow determining the lowest effective dose limiting the risk of secondary neoplasia or impaired growth in children, in whom lower doses of 6 to 8 Gy are recommended. The decision of radiotherapy must be weighed against the risk of the disease. Caution should be the rule in this non-malignant tumour pathology., (Copyright © 2010 Société française de radiothérapie oncologique (SFRO). Published by Elsevier SAS. All rights reserved.)

Introduction: Langerhans cell histiocytosis of the thoracic spine is a rare condition in adults. It is a serious condition with an increased risk of spinal cord compression., Exegesis: A 55-year-old man complained of lumbar and back pain. He developed a spastic paraparesis. Magnetic resonance imaging of the spine showed a spinal cord compression due to bone and epidural tumoral lesions of the eleventh and twelfth thoracic vertebrae, located in the posterior elements of the spine. A surgical biopsy showed an infiltrate of eosinophilic cells, positive for CD1a in immunohistochemistry studies. Final diagnosis was therefore langerhans cell histiocytosis of the thoracic spine complicated by spinal cord compression. The patient received glucocorticoid therapy combined with vinblastine followed by local radiotherapy and etoposide. However, the neurological deficit persisted and the patient finally died., Conclusion: Langerhans cell histiocytosis is a rare cause of spinal cord compression.