1.良性先天性肌病较多见,表现为弥漫性中度肌无力和肌萎缩。5岁左右开始发病,有不能上体育课、不能骑车和跑步等病史。体检可见近端肌受累比远端肌重,伸肌比屈肌受累重,肌无力或轻或重,腱反射减退或消失,可有缓慢进展的关节挛缩。2.亦见于全身营养不良、恶病质(恶性肿瘤晚期等) 1, more common in patients with benign congenital myopathy, manifested as diffuse moderate muscular weakness and muscle atrophy. About 5 years old onset, there can not be physical education, can not ride and run and other medical history. Physical examination shows that the proximal muscle involvement than the distal muscle weight, extensor muscle involvement than the flexor, muscle weakness or light or heavy, tendon reflexes diminish or disappear, there may be slow joint contracture. 2. See also the whole body malnutrition, cachexia (advanced cancer, etc.)