Presentation
Painless swelling of the right dorsal paraspinal region.
Patient Data
Age: 55 years
Gender: Male
From the case:
Soft tissue lipoma - back
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Well-encapsulated fusiform mass of the right dorsal paraspinal region, anterior to the trapezius muscle and posterior to the rhomboid major muscle. It shows a high signal intensity on both T1, and T2, attenuated on suppressed fat sequences (T1 fat sat and STIR) with very thin fibrous septations within and no enhancement on postcontrast sequences.
Case Discussion
MRI features of a soft tissue lipoma of intermuscular location between the rhomboid major muscle anteriorly and trapezius muscle posteriorly.
On imaging, the primary differential diagnoses are:
-
liposarcoma:
- thick septa with enhancement
- or evidence of local invasion
- normal adipose tissue:
- usually non-encapsulated fatty mass
- indistinguishable from the adjacent fatty tissue
The differentiation between intermuscular and intramuscular lipomas can be difficult too.
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