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Nora's lesion, a distinct radiological entity?
E Dhondt1, L Oudenhoven, S Khan
1Department of Radiology, Leiden University Medical Center, Albinusdreef 2, PO Box 9600, 2300, RC Leiden, The Netherlands.
Skeletal Radiology
|April 8, 2006
Summary
Nora's lesion (BPOP) has a distinct radiological appearance and is a reactive bone lesion. It is part of a spectrum including florid reactive periostitis and turret exostosis, aiding differential diagnosis.
Area of Science:
- Musculoskeletal Radiology
- Bone Pathology
- Oncologic Imaging
Background:
- Bizarre parosteal osteochondromatous proliferation (BPOP), or Nora's lesion, is a rare bone lesion.
- Understanding its radiological characteristics and evolution is crucial for accurate diagnosis.
Purpose of the Study:
- To detail the radiological findings of Nora's lesions.
- To describe the natural evolution of BPOP.
- To assess if BPOP belongs to a spectrum of reactive bone lesions.
Main Methods:
- Retrospective analysis of 24 histologically-proven Nora's lesions.
- Radiological assessment by four musculoskeletal radiologists.
- Comparison of imaging findings with pathological review.
Main Results:
- Nora's lesions exhibit a recognizable radiographic presentation.
- Specific MR characteristics are not definitive.
- Natural evolution was assessed in four cases; recurrence was noted in seven cases.
Conclusions:
- Nora's lesion has a distinct radiological presentation and is a reactive lesion.
- It is part of a spectrum including florid reactive periostitis and turret exostosis.
- Radiological differentiation from malignant lesions like osteosarcoma is possible, often obviating immediate biopsy.