Management of Unusual Osteoid Osteoma of Coronoid Process: A Case Report

Osteoid osteomas are rare benign tumors that affect commonly long bones, with typical manifestations, like nocturnal pain and good response to NSAIDs. When presented in juxtaarticular location, in elbow, the diagnosis can be challenging. The typical radiograph shows a nidus in radiolucent area within cortical thickening which can be interpreted as normal when bone overlap occurs. CT scan can be very helpful as diagnostic tool. We report a case of an osteoma osteoid in the coronoid process of ulna conditioning pain and limited ROM despite conservative treatment. Nidus was successfully removed with an anterior approach and en bloc resection, curettage, and radiofrequency ablation. The bone defect was filled with synthetic allograft and full ROM intraoperative confirmed.