Osteoid osteoma: multimodality imaging with focus on hybrid imaging

Area of Science:

• Musculoskeletal Radiology
• Nuclear Medicine
• Oncology

Background:

• Osteoid osteoma is a benign, osteoblastic lesion causing pain, primarily in younger patients.
• Diagnosis can be challenging with conventional radiography and CT, especially in complex anatomical areas.
• Magnetic resonance (MR) imaging may be limited by extensive edema and difficulty in nidus detection.

Purpose of the Study:

• To review the diagnostic imaging modalities for osteoid osteoma.
• To emphasize the role of hybrid imaging techniques in diagnosis and treatment planning.
• To differentiate osteoid osteoma from other conditions with similar presentations.

Main Methods:

• Review of imaging findings across plain radiography, CT, and MR imaging.
• Focus on hybrid imaging modalities: SPECT/CT with ^99mTc-bisphosphonates and PET/CT with ¹⁸F-NaF.
• Discussion of differential diagnoses including osteoblastoma, Brodie's abscess, and stress fractures.

Main Results:

• Hybrid imaging combines radionuclide uptake with morphological detail for accurate osteoid osteoma diagnosis.
• SPECT/CT and PET/CT offer superior diagnostic performance compared to conventional methods in challenging cases.
• ¹⁸F-NaF PET/CT is highlighted for its efficacy, while FDG PET/CT is generally not recommended.

Conclusions:

• Hybrid imaging techniques are crucial for accurate diagnosis and treatment planning of osteoid osteoma.
• Destruction of the nidus via ablation or resection, guided by imaging, leads to pain relief and healing.
• Advanced imaging improves the management of this painful, benign bone lesion.