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目的:了解表现为溶血尿毒综合征(HUS)的甲基丙二酸血症(MMA)患儿的临床特点、治疗效果、转归及预后。方法:收集2012年1月至2019年1月首都医科大学附属北京儿童医院收治的MMA肾损害患儿的病历资料，总结、分析继发HUS患儿的临床表现，实验室、影像学、肾脏组织病理学检查结果，基因分析，治疗情况。随访1～7年。结果:MMA继发肾损害患儿30例，其中8例(26.67%)表现为不典型HUS；确诊年龄1个月14 d～12岁10个月；男女各4例。尿甲基丙二酸水平10～62倍升高，均合并高同型半胱氨酸血症，血甲基丙二酸(1.5～11.8 mg/L)、丙烯肉碱水平(6.33～9.77 μmol/L)、丙烯肉碱/乙烯肉碱比值(0.24～0.29)升高。8例临床表现为不同程度智力及体格发育落后、贫血、黄疸、肾功能异常、血小板降低、血尿、蛋白尿，6例伴高血压，2例频繁呕吐、抽搐发作，2例有阳性家族史。肾组织病理提示血栓性微血管病，系膜区未见电子致密物沉积，肾小管上皮细胞肿胀变性，免疫荧光均阴性。2例基因分析：1例为Cb1C型n MMACHC复合杂合突变[c.80A>G(p.Q27R)；c.217C>T(p.R73X)]及CblX型n HCFC1杂合突变[c.3757G>A(p.R1253C)]双突变；1例为CblC型n MMACHC复合杂合突变[c.365A>T(p.H122L)；c.609 G>A(p.W203X)]。确诊后均予维生素Bn 12等治疗，4例放弃治疗，余病情好转。n 结论:表现为HUS的MMA患儿常合并多脏器衰竭，早期诊断、及时治疗可有效控制病情、改善预后，应长期随访。“,”Objective:To understand clinical characteristics, treatment effects and prognosis of children with methylmalonic acidemia (MMA) presented with hemolytic uremic syndrome(HUS).Methods:The medical records of children with MMA were collected in Beijing Children′s Hospital, Capital Medical University from January 2012 to January 2019, the clinical manifestations, laboratory, imaging material, inspection results, renal pathological, gene analysis, treatment effect, and prognosis of MMA children with renal damage were analyzed, and were followed-up for 1-7 years.Results:Thirty cases were diagnosed as MMA with secondary renal damage.Eight cases(26.67%) showed as MMA-HUS.Age was from 1 month and 14 days to 12 years and 10 months old.There were 4 males and 4 females.The concentration of urine methylmalonic acid increased by 10-62 times.All were combined with hyperhomocysteine(HCY). The level of serum methylmalonic acid(1.5-11.8 mg/L), propylene carnitine(6.33-9.77 μmol/L)and the ratio of propylene /ethylene carnitine (0.24-0.29)were increased.Manifested as the mental and physical development retardation, anemia, jaundice, renal dysfunction, platelet reduction, hematuria, proteinuria in 8 cases, hypertension in 6 cases, frequent vomiting and convulsions in 2 cases.Two cases had a positive family history.Renal pathology showed that mesangial cells and mesangial matrix proliferation broadening, electron dense deposits no mesangial area, renal tubular epithelial cell swelling degeneration, immunofluorescence was negative.Two cases were genetically analyzed. One case was a CblC type n MMACHC compound heterozygous mutation[c.80A>G(p.Q27R); c.217C>T(p.R73X)] and CblX typen HCFC1 heterozygous mutation [c.3757G>A(p.R1253C)] double mutation; 1 case was a CblC typen MMACHC compound heterozygous mutation[c.365A>T(p.H122L); c.609 G>A(p.W203X)]. Children diagnosed were treated with vitamin Bn 12, etc.Four cases of children gave up.The others, after treatment, were improved.n Conclusions:MMA-HUS might be associated with multiple organ failure.Early diagnosis was the key, timely treatment could effectively control the disease, improve the prognosis.It should be followed up for ever.