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[Diagnosis of Erdheim-Chester disease following a traumatic fracture].

We describe the case of a woman with the diagnosis of Erdheim-Chester disease following an upper limb traumatic fracture. A 65-year-old woman presents to the emergency department for left shoulder and right ankle pain, she admits recent multiple falls. Imaging shows a left trochiter fracture and osteosclerotic lesions in the upper and lower limbs. Bone biopsy confirms the suspicion of Erdheim-Chester disease. Erdheim-Chester disease is a rare systemic non- Langerhans cell histiocytosis of the middle-aged adult. The most common characteristic is bilateral and symmetric osteosclerotic lesions in long bones. Pathological examination provides the definitive diagnosis. Imaging and clinical biology assess the extent of the disease. Treatment must be decided on a case-to-case basis taking into account patient's symptoms.