SOUSA, Marco; FREITAS, Daniel    CARDOSO, Pedro. Osteoma Osteóide?. []. , 22, 1, pp.135-141. ISSN 1646-2122.

Osteoid Osteoma (O.O.) is a bone forming neoplasm. It usually affects children and young adults during 2nd and 3rd decades of life, with a male preponderance. Computed tomography is the imaging technique of choice and generally displays a small round or ovoid radiolucent bone lesion with ocasional central calcification, surrounded by variable amounts of reactive osteosclerosis and associated with periosteal reaction. However the appearance of Osteoid Osteoma may be challenging because it may occur at virtually any location in any bone of the skleleton. Minimally invasive percutaneous procedures, especially radiofrequency ablation are now the treatments of choice for most cases of O.O. We presente a case of a patient with a history of mild pain, local swelling and point tenderness on the left lower leg. Although the atypical clinical history and misleading radiological and bone scan findings the diagnosis of osteoid osteoma was made and patient was treated. Unfortunately the correct diagnosis was chronic osteomyelitis. In minimally invasive time, without histologic exam, clinical and radiological findings are the best way to do a correct diagnosis but could not differentiate an osteoid osteoma from osteomyelitis.

: Osteoid Osteoma; radiofrequency ablation; chronic osteomyelitis; diagnosis.

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