Multiple brown tumors mistaken for bone metastases. Computed tomography imaging findings

In daily practice, when multiple osteolytic lesions are seen on imaging studies, metastatic bone disease is the first diagnostic impression. We herein present a case of a 45-year-old man, without any known tumor, who was evaluated for multiple osteolytic lesions with a strong suspicion of bone metastasis, but the radiological and biochemical findings suggested a hyperparathyroidism. Therefore, whenever multiple osteolytic lesions are found in a patient without any known tumor, metabolic bone diseases including hyperparathyroidism should be highly considered.