MRI characteristics associated with high-grade myxoid liposarcoma

L. H. Gimber, E. A. Montgomery, C. D. Morris, Elizabeth A Krupinski, L. M. Fayad

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Abstract

Aim To identify magnetic resonance imaging (MRI) features differentiating high-grade (>5% round-cell component) from low-grade myxoid liposarcomas (LPS) (≤5% round-cell component). Materials and methods Informed consent was waived. Patients with myxoid LPS and MRI before biopsy, neoadjuvant therapy, and surgery were included retrospectively. High-grade components were recorded from histological specimens by a pathologist (24 years of experience). Images were evaluated by a senior radiologist (>12 years of experience) for tumour size, location, tissue layer, and MRI features (signal intensity, heterogeneity, margin, and perilesional characteristics). Descriptive statistics, Fisher's exact test to identify associations with a round-cell component, and multivariate logistic regression to identify independent predictors of high-grade tumours were used. Results Thirty-one patients (16 women [mean 51.1 years; range 19–79 years] and 15 men [mean 45.5 years; range 18–95 years]) with myxoid LPS (23 low-grade, eight high-grade) were included. All high-grade lesions had lipid signal, a peritumoural capsule and peritumoural contrast enhancement, and more commonly exhibited heterogeneous signal; however, the average size of ≥10 cm was the strongest independent indicator of high-grade status (odds ratio [OR], 14.6; 95% confidence interval [CI]: 1.6, 131). Conclusion Size ≥10 cm is most strongly associated with high-grade myxoid LPS (round-cell component >5%). Other features possibly differentiating high-grade from low-grade status include lesion margin, lipid signal, and perilesional characteristics.

Original languageEnglish (US)
Pages (from-to)613.e1-613.e6
JournalClinical Radiology
Volume72
Issue number7
DOIs
Publication statusPublished - Jul 1 2017
Externally publishedYes

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ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

Cite this

Gimber, L. H., Montgomery, E. A., Morris, C. D., Krupinski, E. A., & Fayad, L. M. (2017). MRI characteristics associated with high-grade myxoid liposarcoma. Clinical Radiology, 72(7), 613.e1-613.e6. https://doi.org/10.1016/j.crad.2017.01.016