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Radiologia Brasileira

versão impressa ISSN 0100-3984versão On-line ISSN 1678-7099

Resumo

COSTA, Flávia Martins et al. The usefulness of chemical-shift magnetic resonance imaging for the evaluation of osteoid osteoma. Radiol Bras [online]. 2018, vol.51, n.3, pp.156-161. ISSN 1678-7099.  https://doi.org/10.1590/0100-3984.2017.0037.

Objective:

The purpose of this study was to determine whether chemical-shift magnetic resonance imaging (MRI) could be useful in the diagnosis of osteoid osteoma when clinical and radiological tumor features are inconclusive.

Materials and Methods:

This retrospective study included 17 patients who underwent chemical-shift MRI for the evaluation of osteoid osteoma. For all patients, two musculoskeletal radiologists independently recorded signal intensities on in-phase and out-of-phase images in the nidus of the tumor, in abnormal-intensity bone marrow surrounding the lesion, and in normal-appearing bone marrow. For each region, relative signal intensity ratios were calculated by dividing out-of-phase by in-phase values. Relative ratios > 1 were considered indicative of neoplastic lesions. Statistical analysis was carried out to analyze the sample. Inter-observer and intra-observer agreement for each imaging method were assessed using intraclass correlation coefficients according to the Fleiss method and a value > 0.65 was considered to indicate substantial agreement.

Results:

The mean relative signal intensity ratios were 1.2 (range, 0.9-1.4) for the nidus and 0.35 (range, 0.11-0.66) for the surrounding tissue; these values differed significantly from the relative signal-intensity ratios for normal-appearing bone marrow (p < 0.05).

Conclusion:

Chemical-shift MRI is useful for the diagnosis and evaluation of osteoid osteoma.

Palavras-chave : Osteoma, osteoid; Magnetic resonance imaging; Neoplasms, bone tissue.

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