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Skeletal Radiology
Published in: Skeletal Radiology 9/2007

Open Access 01-09-2007 | Scientific Article

The healing pattern of osteoid osteomas on computed tomography and magnetic resonance imaging after thermocoagulation

Authors: Geert M. Vanderschueren, Antoni H. M. Taminiau, Wim R. Obermann, Annette A. van den Berg-Huysmans, Johan L. Bloem, Arian R. van Erkel

Published in: Skeletal Radiology | Issue 9/2007

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Abstract

Objective

To compare the healing pattern of osteoid osteomas on computed tomography (CT) and magnetic resonance imaging (MRI) after successful and unsuccessful thermocoagulation.

Materials and methods

Eighty-six patients were examined by CT and 18 patients by dynamic gadolinium-enhanced MRI before and after thermocoagulation for osteoid osteoma. Thermocoagulation was successful in 73% (63/86) and unsuccessful in 27% (23/86) of patients followed by CT. Thermocoagulation was successful in 72% (13/18) of patients followed by MRI. After treatment, the healing of the nidus on CT was evaluated using different healing patterns (complete ossification, minimal nidus rest, decreased size, unchanged size or thermonecrosis). On MRI the presence of reactive changes (joint effusion, “oedema-like” changes of bone marrow and soft tissue oedema) and the delay time (between arterial and nidus enhancement) were assessed and compared before and after thermocoagulation.

Results

Complete ossification or a minimal nidus rest was observed on CT in 58% (16/28) of treatment successes (with > 12 months follow-up), but not in treatment failures. “Oedema-like” changes of bone marrow and/or soft tissue oedema were seen on MR in all patients before thermocoagulation and in all treatment failures. However, residual “oedema-like” changes of bone marrow were also found in 69% (9/13) of treatment successes. An increased delay time was observed in 62% (8/13) of treatment successes and in 1/5 of treatment failures.

Conclusion

Complete, or almost complete, ossification of the treated nidus on CT correlated with successful treatment. Absence of this ossification pattern, however, did not correlate with treatment failure. CT could not be used to identify the activity of the nidus following treatment. The value of MR parameters to assess residual activity of the nidus was limited in this study.
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Metadata
Title
The healing pattern of osteoid osteomas on computed tomography and magnetic resonance imaging after thermocoagulation
Authors
Geert M. Vanderschueren
Antoni H. M. Taminiau
Wim R. Obermann
Annette A. van den Berg-Huysmans
Johan L. Bloem
Arian R. van Erkel
Publication date
01-09-2007
Publisher
Springer-Verlag
Published in
Skeletal Radiology / Issue 9/2007
Print ISSN: 0364-2348
Electronic ISSN: 1432-2161
DOI
https://doi.org/10.1007/s00256-007-0319-1

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