[Tibial brown tumor as a presentation of primary hyperparathyroidism].

Cystic fibrous osteitis is a complication of a very evolved hyperparathyroidism. Because the determination of calcium, parathyroid hormone and vitamin D have become routine studies, this bone complication is uncommon in western countries. However, it should be considered in the differential diagnosis of hypercalcemia and lytic bone lesions. The treatment is to suppress the excess parathyroid hormone by parathyroidectomy and osteosynthesis in pathological fracture. We present the case of a female patient with primary hyperparathyroidism and a brown tumor in the right tibia.