肌源性肌病和神经源性肌病CT共同特征为肌块体积缩小、间隙增宽、密度减低。前者如多发性肌炎、假肥大型肌营养不良症在肌萎缩前早期出现密度降低;呈点状、条索状、蜂窝状、蚕蚀状、最终呈均片状低密区。后者如运动神经元疾病、周围神经病,先有肌萎缩,密度减低较迟,因病因与损害部位不同,除腓骨肌萎缩症外,常不规則,不对称。后期均有相似密度改变。病理证实密度减低乃纤维脂肪组织浸润所致。 Myogenic myopathy and neuromuscular myopathy CT common feature of the muscle mass is reduced, the gap widened, reduced density. The former, such as polymyositis, Duchenne muscular dystrophy in the early muscle atrophy appeared to reduce the density; was dotted, cords, honeycombs, silkworm-like, and eventually showed the average low-density area. The latter, such as motor neuron disease, peripheral neuropathy, first atrophy, delaying the density later, due to etiology and lesion site, in addition to Charcot-Marie-Tooth Disease, often irregular, asymmetric. Late similar density changes. Pathology confirmed that the density is reduced due to fibrous adipose tissue infiltration.