良性单肢肌萎缩 (benign monom elic am yotrophy,BMA )是种少见疾病 ,多见于亚洲人群 ,欧美报道甚少。我们收集 1987年以来诊治的 4例患者的临床资料 ,予以报道。1　临床资料例 1,男 ,30岁。无意中发现右手肌萎缩伴精细动作受限1年 ,不伴其他不适。起病前 2年有右肘轻度外伤史 Benign monom elic amyotrophy (BMA) is a rare disease, more common in Asian populations, rarely reported in Europe and the United States. We collected the clinical data of 4 patients diagnosed and treated since 1987 and reported them. 1 clinical data example 1, male, 30 years old. Inadvertent discovery of right atrial muscle atrophy with fine motor movement is limited to 1 year without any discomfort. 2 years before onset of right elbow mild trauma history