Large well-defined intermuscular soft tissue mass of the anterior aspect of the right forearm displacing the adjacent muscles mainly the brachiordialis, supinator and pronator teres. It elicits a high signal on T1 and T2 (isointense to the subcutaneous fat) and attenuates on fat sat sequences with thin internal septae of low signal on T2 sequences. A thin rim of peripheral enhancement is seen on postcontrast sequences (peripheral fibrous capsule).