Osteoid osteoma of the patella: a case report
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- Vallianatos, P.G., Tilentzoglou, A.C., Seitaridis, S.V. et al. Knee Surg Sports Traumatol Arthrosc (2006) 14: 161. doi:10.1007/s00167-005-0653-6
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Though osteoid osteoma is a common primary benign lesion of the bones, intra-articular involvement is rare and poses diagnostic difficulties when it affects middle-aged patients. We present the case of a 51-year-old woman with a 2.5 year history of anterior knee pain that was misdiagnosed as osteochondritis dissecans. Radiological findings were absent, whereas MRI showed a well-circumscribed lesion. A local excisional biopsy was performed and microscopic appearance confirmed diagnosis.