Clinical history: 50-year old man with progressively enlarging left upper arm mass for one year   Diagnosis: Dermatofibrosarcoma protuberans   Imaging techniques: Imaging of the left upper arm was performed on a 3T MR system (Skyra, Siemens). (A) Coronal T2-weighted TIRM (TR/TE 2734/38), (B) axial T1-weighted TSE (TR/TE 500/12ms), and (C) axial T2-weighted TSE […] [...]