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Introduction. Primary hyperparathyroidism may have several presentations, varying from an incidental asymptomatic biochemical finding to gastrointestinal, psychiatric, renal and bone manifestations. Brown tumors are rare non-neoplastic lesions because of abnormal bone metabolism. Herein, we describe a patient who presented with lytic bony lesions and severe asymptomatic hypercalcemia due to parathyroid adenoma. Case presentation. A 38-year-old male presented with multiple painful bony lesions over upper and lower limbs. Radiographs of long bones showed multiple lytic lesions with cortical thinning. Investigations revealed hypercalcemia and hyperparathyroidism. A radionuclide scan showed parathyroid adenoma. The patient was treated for hypercalcemia and a parathyroidectomy was performed. Conclusions. In a patient presenting with multiple bony swellings and asymptomatic hypercalcemia, hyperparathyroidism should be suspected. Parathyroid adenoma is a treatable cause of primary hyperparathyroidism. [ABSTRACT FROM AUTHOR]