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Osteoid osteoma with an atypical nidus: A case report
Khodamorad Jamshidi1, Reza Shafipour, Iman Qomashi
1Associate Professor of Orthopaedic Surgery, Tehran University of Medical Sciences, Shafa Yahyaian Hospital, Baharestan Sq., Tehran, Iran.
Summary
Osteoid osteoma, a benign bone tumor, typically presents with a small nidus and surrounding sclerosis. This case highlights an unusual osteoid osteoma with a nearly completely calcified nidus, challenging typical radiographic diagnosis.
Area of Science:
- Orthopedic Oncology
- Skeletal Radiology
- Bone Pathology
Background:
- Osteoid osteoma is a common benign bone tumor.
- It typically occurs in young adults and can affect any bone, most commonly the femur and tibia.
- Radiographic findings are usually diagnostic, showing a nidus less than 1.5 cm surrounded by sclerosis.
Observation:
- A case of osteoid osteoma with an unusual radiographic appearance is presented.
- The nidus, the central core of the tumor, was nearly completely calcified.
- This calcification obscured the typical nidus appearance on imaging.
Findings:
- The presented osteoid osteoma exhibited significant calcification within the nidus.
- This atypical feature may complicate the radiographic diagnosis of osteoid osteoma.
- Histopathological correlation is crucial for definitive diagnosis in such cases.
Implications:
- This case expands the spectrum of radiographic appearances for osteoid osteoma.
- Radiologists should consider atypical presentations, especially when a nidus is poorly visualized.
- Accurate diagnosis is essential for appropriate management and to differentiate from other bone lesions.
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