Eight year old girl was referred to our consultation for a lameness with a flessum of the left hip with fever (38.5°C). Biology showed an inflammatory syndroma (CRP: 29 mg/l). Pelvic X-ray showed an osteolysis of the roof of the left acetabulum with regular contour (A). Magnetic resonance imaging (MRI) showed tissue thinning and damage to the roof of the left acetabulum (B). A scanno-guided biopsy was performed, anatomopathological study confirmed the diagnosis of Langerhans cell histiocytosis. A discharge, with traction was done. The child has improved and biology has normalized. The radiograph of the hip after 1 year showed a filling of the gap (C). Langerha's cell histiocytosis is a proliferation of mononuclear phagocytic cells. It is also called eosinophilic granuloma. It is often located at the skull and spine. The localization at the hip represents only 8% of the cases it is especially supra-acetabular it's spontaneous evolution is favorable.

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Corresponding author
Zied Jlalia, Pediatric Orthopedics Department, Kassab Institute of Orthopedic Surgery, Ksar Said, Tunisia (jlalia.zied@gmail.com)