Maxillary brown tumour: the only manifestation of normocalcemic primary hyperparathyroidism (a case report).

Brown tumour is a rare complication of hyperparathyroidism, usually associated with high serum calcium levels. As the only and first symptom of normocalcaemic primary hyperparathyroidism (NPHP), it is an extremely rare occurrence. In the facial region, mandibular involvement is most common but maxillary involvement is exceptional. Their treatment is generally conservative and is based on the normalisation of calcium, phosphorus and parathormone levels. NPHP is becoming an increasingly emerging entity due to the frequent testing of different parameters of the phosphocalcic balance. Before making the diagnosis of NPHP, other etiologies of secondary hyperparathyroidism should be ruled out. According to international guidelines, NPHP will be managed in the same way as asymptomatic hyperparathyroidism. We report a rare case of a patient with a maxillary tumour whose investigations concluded to be a brown tumour secondary to NPHP.