Differentiation of myxoid liposarcoma by magnetic resonance imaging: a histopathologic correlation.
Acta Radiol
; 55(8): 952-60, 2014 Oct.
Article
em En
| MEDLINE
| ID: mdl-24123962
ABSTRACT
BACKGROUND:
Myxoid liposarcomas represent a heterogeneous group of soft tissue tumors in which prognosis is dependent on differentiation.PURPOSE:
To identify magnetic resonance imaging (MRI) criteria to distinguish low-grade from high-grade myxoid liposarcomas. MATERIAL ANDMETHODS:
MR images of 30 histologically proven myxoid liposarcomas were retrospectively reviewed. Tumors were evaluated according to size, localization, tumor border, and structure as well as tumor composition. These imaging criteria were correlated with histopathological findings.RESULTS:
Nineteen myxoid liposarcomas were histologically classified as low-grade myxoid liposarcomas, whereas 11 were considered high-grade myxoid liposarcomas. Mean tumor volume of low-grade myxoid liposarcomas (710.1 ± 960.1 ccm) was significantly smaller as compared to high-grade myxoid liposarcomas (2737.0 ± 3423.7 ccm; P = 0.04). In addition to necrotic areas, three tumor components - fatty, myxoid, as well as contrast-enhancing non-fatty, non-myxoid - could be identified. The mean fraction of fatty tumor areas in low-grade myxoid liposarcomas was 10 ± 11% as compared to 6 ± 4% for high-grade myxoid liposarcomas (P = 0.66). Myxoid components accounted for 88 ± 16% in low-grade myxoid liposarcomas, but only for 45 ± 25% in high-grade myxoid liposarcomas (P < 0.0001). The non-fatty, non-myxoid tumor fraction was significantly higher in high-grade myxoid liposarcomas (50 ± 25%) as compared to low-grade myxoid liposarcomas (2 ± 9%; P < 0.0001). A proportion of > 5% of this tumor fraction was found to be a precise unique predictor for high-grade myxoid liposarcomas with a sensitivity of 100% and a specificity of 95%.CONCLUSION:
Tumor components with contrast-enhancing non-fatty, non-myxoid imaging features were predominantly found in high-grade myxoid liposarcomas, which may histologically resemble round cell clusters.Palavras-chave
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Base de dados:
MEDLINE
Assunto principal:
Neoplasias de Tecidos Moles
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Imageamento por Ressonância Magnética
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Lipossarcoma Mixoide
Tipo de estudo:
Diagnostic_studies
/
Observational_studies
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Prognostic_studies
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Risk_factors_studies
Limite:
Humans
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Middle aged
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article