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Skeletal Radiology

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01-12-2018 | Scientific Article

¹⁸F-FDG PET/CT and MRI features of myxoid liposarcomas and intramuscular myxomas

Authors: Brendan W. Lunn, Laurel A. Littrell, Doris E. Wenger, Stephen M. Broski

Published in: Skeletal Radiology | Issue 12/2018

Abstract

Objective

To examine the imaging characteristics of intramuscular myxomas (IM) and myxoid liposarcomas (MLS) on ¹⁸F-FDG PET/CT and MRI.

Materials and methods

With IRB approval, our institutional imaging database was searched for pathologically proven IM and MLS evaluated by ¹⁸F-FDG PET/CT and MRI. PET/CT and MRI imaging characteristics were recorded and correlated with pathologic diagnosis.

Results

We found eight patients (2 M, 6 F) with IM (mean age 65.6 ± 10.4 years) and 16 patients (7 F, 9 M) with MLS (mean age 42.8 ± 16.3 years). MRI was available in 7/8 IM and 15/16 MLS patients. There was no significant difference between the two groups in SUVmax (IM 2.7 ± 0.8, MLS 3.0 ± 1.0; p = 0.35), SUVmean (1.7 ± 0.4, 1.5 ± 0.5; p = 0.40), total lesion glycolysis (101.8 ± 127.3, 2420.2 ± 4003.3 cm³*g/ml; p = 0.12), metabolic tumor volume (62.3 ± 71.1, 1742.9 ± 3308.0 cm³; p = 0.17) or CT attenuation (p = 0.70). MLS occurred in younger patients (p = 0.0015), were larger (16.4 ± 8.2 vs. 5.6 ± 2.5 cm; p = 0.0015), more often T1 hyperintense (p = 0.03), with nodular enhancement (p = 0.006), and macroscopic fat on CT (p = 0.0013) and MRI (p = < 0.001) compared to myxomas.

Conclusions

IM and MLS most commonly demonstrate low-grade FDG activity and overlapping metabolic measures on PET/CT. MRI is useful in differentiation, but MLS can present without macroscopic fat on MRI, underscoring the importance of radiologic-pathologic correlation for accurate diagnosis.

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Title: 18F-FDG PET/CT and MRI features of myxoid liposarcomas and intramuscular myxomas
Authors: Brendan W. Lunn
Laurel A. Littrell
Doris E. Wenger
Stephen M. Broski
Publication date: 01-12-2018
Publisher: Springer Berlin Heidelberg
Published in: Skeletal Radiology / Issue 12/2018
Print ISSN: 0364-2348
Electronic ISSN: 1432-2161
DOI: https://doi.org/10.1007/s00256-018-3000-y

Keynote webinar | Spotlight on medication adherence

Springer Medicine

¹⁸F-FDG PET/CT and MRI features of myxoid liposarcomas and intramuscular myxomas

Abstract

Objective

Materials and methods

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Objective

Materials and methods

Results

Conclusions

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