Osseous mastocytosis of the knee.

Mastocytosis is a rare pathology with possible bone involvement. This report describes an unusual case of solitary osteolytic lesion of the proximal right tibia, revealing an osseous mastocytosis, treated by bone cement injection. Follow-up showed a good clinical and radiological outcome, and the patient remains symptom-free 9 months after her surgery. To our knowledge, this is the first case reported in the literature.