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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
PubMed
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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.

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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.