Osteoid osteoma simulating an osteocartilaginous exostosis

Ale Marinelli, S. Giacomini, G. Bianchi, A. Pellacani, F. Bertoni, M. Mercuri

Research output: Contribution to journalArticlepeer-review


We describe a case of osteoid osteoma in the tibia of a 3-year-old patient who presented with a clinical and radiographic picture that suggested an exostosis. The formation of osteoid osteoma with a radiographic picture similar to that of osteophytes or exostosis has been previously documented only rarely. The authors hypothesize that the exostosis-like formation observed was actually the calcification of soft tissues that formed after the intense periosteal inflammatory reaction caused by the osteoid osteoma. As a result of its peculiar clinical and radiographic presentation, diagnosis of this lesion was delayed. Being located close to the medial growth plate of the tibia, it caused lengthening of the limb with a pronounced valgus deviation of the knee. An excisional biopsy provided histological evidence, clinical resolution and immediate pain relief, but incomplete resolution of the valgus deformity of the knee.

Original languageEnglish
Pages (from-to)181-185
Number of pages5
JournalSkeletal Radiology
Issue number3
Publication statusPublished - Mar 2004


  • CT
  • MR
  • Osteoid osteoma
  • Radiography
  • Tibia
  • Valgus deviation

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology


Dive into the research topics of 'Osteoid osteoma simulating an osteocartilaginous exostosis'. Together they form a unique fingerprint.

Cite this