A 24-year-old woman, with 5 years of left elbow pain, was given a preliminary diagnosis of focal pigmented villonodular synovitis based on magnetic resonance imaging. She underwent arthroscopic debridement and was found to have an intra-articular bony mass. Histopathology was consistent with an intra-articular osteoid osteoma. The mass was removed arthroscopically with excellent symptomatic improvement. There was no recurrence of symptoms at 1 year follow-up.
Westbom, Catherine M.; John E. Nolan; and Nathan T. Morrell. "Intra-Articular Osteoid Osteoma of the Elbow: A Case Report." Western Journal of Orthopaedics 9, 1 (2020). https://digitalrepository.unm.edu/wjo/vol9/iss1/15