biostudies-literatureUnknown20(1)Vlaic J<h4>Background</h4>Osteoid osteoma is a painful benign skeletal tumour of unknown aetiology. Most often it occurs in the long bones of extremities and responds well to nonsteroidal anti-inflammatory medications. However, unusual localization and atypical presentation of this tumour might present a diagnostic challenge, especially if symptoms mimic that indicative of juvenile spondyloarthritis.<h4>Case presentation</h4>A misdiagnosed ten-and-a-half-year-old girl with osteoid osteoma involving the distal phalanx of a little finger is presented. Her initial symptoms were pain and swelling of the little finger resembling dactylitis, while various imaging modalities showed signs of tenosynovitis, indicating a possible development of juvenile spondyloarthritis. Several trials of different non-stBMC musculoskeletal disorders17https://www.ebi.ac.uk/biostudies/studies/S-EPMC6323825biostudies-literatureUnusual localization and presentation of osteoid osteoma mimicking juvenile spondyloarthritis: a case report.PMC6323825Vlaic JSimunic SBojic DLamot LHarjacek MfalseUnusual localization and presentation of osteoid osteoma mimicking juvenile spondyloarthritis: a case report.<h4>Background</h4>Osteoid osteoma is a painful benign skeletal tumour of unknown aetiology. Most often it occurs in the long bones of extremities and responds well to nonsteroidal anti-inflammatory medications. However, unusual localization and atypical presentation of this tumour might present a diagnostic challenge, especially if symptoms mimic that indicative of juvenile spondyloarthritis.<h4>Case presentation</h4>A misdiagnosed ten-and-a-half-year-old girl with osteoid osteoma involving the distal phalanx of a little finger is presented. Her initial symptoms were pain and swelling of the little finger resembling dactylitis, while various imaging modalities showed signs of tenosynovitis, indicating a possible development of juvenile spondyloarthritis. Several trials of different non-st2019-01-01T00:00:00Z2019 Jan2025-04-19T13:55:33.521Z2019-03-26T22:36:19ZS-EPMC63238253062169010.1186/s12891-018-2383-1