Distal femoral lytic lesion in a 14-year-old boy.

A 14-year-old boy was referred to the authors' institute with a 2'/2 month history of increasing pain in the left knee. At the time of presentation the patient reported that the pain was awakening him at night and making it increasingly difficult to bear weight on the affected leg. He denied any history of trauma. The patient had a significant history of spontaneous epistaxis since he was 2 years of age and was unable to continue taking a prescribed course of

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