Eosinophilic granuloma - proximal femur

Discussion:

This patient has known (pathologically confirmed) Langerhans cell histiocytosis involving the skull and left femur. He went on to have prophylactic intra-medullary nail placement to prevent a fracture. The location of this lesion, within the cortex, is somewhat atypical with most such lesions located within the medullary cavity - appearance is however variable. 

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