{Reference Type}: Case Reports {Title}: [A case of simultaneous haploinsufficiency of A20 and methylmalonic aciduria]. {Author}: Lin L;Wang HJ;Mei SY;Li Z;Cheng YB; {Journal}: Zhonghua Er Ke Za Zhi {Volume}: 61 {Issue}: 3 {Year}: Mar 2023 2 暂无{DOI}: 10.3760/cma.j.cn112140-20220811-00722 {Abstract}: 患儿 男,6月龄,因“反复发热2个月余”就诊,基因检测发现同时存在2个基因缺陷。TNFAIP3基因存在c.1243_1247del杂合变异,为未报道的新发变异;MMACHC基因存在c.349G>C和c.482G>A复合杂合变异。确诊A20单倍剂量不足及甲基丙二酸尿症2种罕见遗传病,给予羟钴胺、左卡尼汀、沙利度胺等治疗。随访3年,患儿生长发育正常,腹泻好转,仍有反复发热。.