Abstract
Objective
To investigate the septum-like structures in pre-dominantly lipomatous tumors, by correlating fat-suppressed MR images with histopathologic findings.
Design and patients
The MR findings of three cases of well-differentiated liposarcoma (atypical lipoma), one case of lipoma-like component of dedifferentiated liposarcoma, and nine cases of lipoma were analyzed. T1-, T2-, and fat-suppressed T1-weighted images after Gd-DTPA administration were obtained. Surgical specimens from five patients (four with liposarcoma and one with lipoma) were also scanned with a MR unit, and compared with the pathologic findings.
Results and conclusions
Enhancement features of lipoma and liposarcoma were well visualized on fat-suppressed T1-weighted images after Gd-DTPA administration. The septum-like structures of liposarcoma are thick and enhanced considerably, while septa of lipoma are thin and enhanced only slightly. Pathologically, the septum-like structures of liposarcoma contained muscle fibers and the septa of lipoma represented fibrous capsule. Identification of well-enhanced septa in a predominantly lipomatous tumor helps to differentiate malignant tumors from lipomas. As the septum-like structures of lipo-sarcoma contain a skeletal muscle component the tumor might need more extensive surgical procedures including resection of adjacent muscles.
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References
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Hosono, M., Kobayashi, H., Fujimoto, R. et al. Septum-like structures in lipoma and liposarcoma: MR imaging and pathologic correlation. Skeletal Radiol 26, 150–154 (1997). https://doi.org/10.1007/s002560050211
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DOI: https://doi.org/10.1007/s002560050211