The axial T2-weighted image revealed a homogeneously intermediate signal lesion located within the medial compartments in the left arm. The hypo-intense median nerve is completely encased by the round-shaped mass (A). On the axial T1-weighted image (B) the lesion is isointense to skeletal muscle. The axial enhanced T1-weighted image (C) and axial fat-saturated enhanced T1-weighted image (D) show mildly uniform enhancement and a small area of necrosis. The coronal fat-suppression proton-density fast spin echo image. (E) demonstrates the mass in direct continuity with the median nerve with a fusiform shape. A well-defined lesion is noted on the coronal blade fat-suppression proton-density image (F).