Brown tumor, also known as osteitis fibrosa cystica and rarely as osteoclastoma, is one of the manifestations of hyperparathyroidism. It represents a reparative cellular process, rather than a neoplastic process. Histologically brown tumors are identical to giant cell tumor (both are osteoclastomas), and therefore, this entity can easily be misdiagnosed as such if elevated blood calcium and/or parathyroid hormone levels are not assessed for and identified.