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Osteoid osteoma simulating an osteocartilaginous exostosis
A Marinelli1, S Giacomini, G Bianchi
1Rizzoli Orthopedic Institute, University of Bologna, Via Pupilli 1, 40127 Bologna, Italy. alemarinelli@libero.it
Skeletal Radiology
|January 24, 2004
Summary
A rare case of osteoid osteoma in a child mimicked an exostosis, delaying diagnosis. Surgical removal resolved pain but not the limb length discrepancy and valgus deformity.
Area of Science:
- Pediatric Orthopedics
- Skeletal Dysplasias
- Bone Tumors
Background:
- Osteoid osteoma is a benign bone tumor typically presenting with nocturnal pain.
- Radiographic misdiagnosis as exostosis or osteophyte is uncommon.
- Periosteal reaction can lead to soft tissue calcification, mimicking other bone lesions.
Observation:
- A 3-year-old presented with tibia osteoid osteoma, exhibiting radiographic features of an exostosis.
- The lesion's proximity to the medial growth plate caused limb lengthening and valgus knee deformity.
- Delayed diagnosis resulted from the unusual clinical and radiographic presentation.
Findings:
- Histological examination confirmed osteoid osteoma.
- Excisional biopsy provided immediate pain relief and clinical resolution.
- Incomplete resolution of the valgus deformity was noted post-surgery.
Implications:
- Highlights the importance of considering osteoid osteoma in pediatric differential diagnoses, even with atypical presentations.
- Underscores the potential for periosteal reaction to cause secondary soft tissue ossification, complicating diagnosis.
- Suggests that surgical intervention may not fully correct growth plate-related deformities, necessitating further management.