MRI
Coronal STIR
Coronal T1
Axial T2 fat sat
Sagittal T2
Sagittal STIR
Sagittal T1
A large well encapsulated mass lesion is seen subcutaneously in upper arm, appearing hypointense on T1W and hyperintense on T2W images and fat-suppressed sequence. Correlative ultrasonography (not included here) ruled out any cystic lesion or abscess, and a relatively homogenous soft tissue lesion was seen, with fibrous septations in periphery (also seen on MRI images).