1临床资料患者女性,46岁。发现左上臂肿物1年余,近2个月胀痛明显。MR示左侧上臂下段外侧肌间隔前方肌间隙内占位病变,大小2.4 cm×1.6 cm×5.5 cm,呈不均匀等T1、不均匀长T2信号影,压脂像呈不均匀高信号,形态不规则,边界清晰,肱肌受压向内侧移位(图1,2)。2病理检查2.1巨检肿物椭圆形,大小5.2 cm×3.5 cm×1 cm,表面 1 Clinical data Patient female, 46 years old. I found the left upper arm tumor more than 1 year, nearly 2 months obvious pain. MR showed space occupying lesion in the anterior interosseous space of the lateral muscle of the lower arm of the left lower arm with a size of 2.4 cm × 1.6 cm × 5.5 cm with uneven T1 and non-uniform long T2 signal signs. Irregular, clear boundary, the brachial muscle displaced inward (Figure 1, 2). 2 pathological examination 2.1 huge test mass oval, size 5.2 cm × 3.5 cm × 1 cm, the surface