[Maxillary tumor revealing primary hyperparathyroidism].

Introduction: Primary hyperparathyroidism can infrequently present as a giant cell tumor of the jaw. We report the case of a patient presenting with a giant cell tumor leading to the discovery of a parathyroid adenoma.
Observation: A 70-year-old male patient consulted for a stiffly swollen right jaw. The radiological assessment revealed osteolytic lesions of the right maxilla. The calcium and phosphate levels were disrupted and the parathyroid hormone level was high. A neck ultrasonography revealed a parathyroid adenoma. The patient underwent excision of the maxillary mass and of the parathyroid adenoma; the outcome was marked by normalization of calcium and phosphate levels.
Discussion: Giant cell tumors unusually reveal primary hyperparathyroidism and their maxillary location is exceptionally rare. The diagnosis is made on parathyroid hormone level and imaging. The treatment is surgical.
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