Painless swelling of the right vulvoperineal region.
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The MRI sequences demonstrate a well-encapsulated lobulated mass in the right vulvoperineal region of high signal on both T1WI/T2WI and attenuated on suppressed fat sat sequences. Multiple thin fibrous septations within (<2 mm) with minimal enhancement on postcontrast sequences.
MRI features of a pelvic floor lipoma.
The main differential diagnosis should include:
- normal adipose tissue: usually non encapsulated fatty mass, indistinguishable from the adjacent fatty tissue
- thick septa with enhancement
- inhomogeneous attenuation, with significant amounts of soft-tissue within the fatty mass
- poor definition of the adjacent structures or evidence of local invasion