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Treatment-related alterations of imaging findings in osteoid osteoma after percutaneous radiofrequency ablation

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Abstract

Objectives

We aimed to report the long-term outcomes of osteoid osteoma patients and to determine CT and dynamic contrast-enhanced MR imaging characteristics of radiofrequency ablation (RFA) treatment related changes of osteoid osteoma between follow-up periods.

Materials and methods

Thirty patients (seven female, 23 male) who underwent CT-guided RFA of osteoid osteoma were included. Follow-up imaging examinations were divided into two subgroups; first (1–3 months) and second (> 6 months) periods. Nidus size, calcification, cortical thickening, maximum signal intensity (SImax), time of SImax (Tmax), slope of signal intensity-time (SIT) curves were noted. CT and dynamic MR imaging findings were compared between follow-up periods.

Results

Clinical success rate was 100%. The mean of OO nidi size was 5.85 ± 1.98 mm before treatment. There was a significant difference for OO nidi sizes between pretreatment and second follow-up period examinations (p = 0.002). SImax and slope of SIT curves of all patients (100%) showed decrease on follow-up MRIs. There was a significant decrease for SImax values between pretreatment and second follow-up period. There was a significant decrease for slope of SIT curves between pretreatment and both follow-up periods.

Conclusions

RFA is an effective and safe treatment choice for osteoid osteomas. On follow-up imaging, slope of SIT curve and Tmax have the most important positive predictive value for long-term outcomes and single dynamic contrast-enhanced MRI within first 3 months after treatment may be sufficient for symptom-free patients.

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Authors and Affiliations

  1. Gazi University Faculty of Medicine, Department of Radiology, Gazi Hastanesi, Besevler, 06500, Ankara, Turkey

    Gonca Erbaş, Halit Nahit Şendur, Hüseyin Koray Kiliç, Emetullah Cindil, Ali Yusuf Öner, Nil Tokgöz & Erhan Turgut Ilgit

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  1. Gonca Erbaş
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  2. Halit Nahit Şendur
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  3. Hüseyin Koray Kiliç
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  4. Emetullah Cindil
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  5. Ali Yusuf Öner
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  6. Nil Tokgöz
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Correspondence to Gonca Erbaş.

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Erbaş, G., Şendur, H.N., Kiliç, H.K. et al. Treatment-related alterations of imaging findings in osteoid osteoma after percutaneous radiofrequency ablation. Skeletal Radiol 48, 1697–1703 (2019). https://doi.org/10.1007/s00256-019-03185-1

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  • DOI: https://doi.org/10.1007/s00256-019-03185-1

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