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目的:探讨儿童肝脏纤维蛋白原储积病（fibrinogen storage disease，FSD）的临床病理及分子学特征。方法:收集复旦大学附属儿科医院2019年9月至2021年1月FSD 4例的临床资料、病理组织学、免疫表型、超微结构及基因测序结果，并对其进行回顾性分析。结果:4例FSD，男患儿3例、女患儿1例，年龄为3岁3个月至6岁，中位年龄为3岁4个月。临床表现为肝功能异常和凝血功能异常；2例有家族史。肝脏活检组织学显示肝细胞脂肪变性，伴纤维组织增生和炎性细胞浸润。肝细胞胞质内可见单个或多个大小不一的嗜酸性小体，周边围以透亮空晕。免疫组织化学染色显示嗜酸性小体对抗纤维蛋白原抗体呈阳性反应。电镜下嗜酸性小体由粗面内质网腔扩张，大量管状结构排列成弯曲条束形的指纹样结构。基因测序发现2例FGG突变位于第8号外显子c.1106A>G（p.His369Arg）和c.905T>C（p.Leu302Pro），1例位于第9号外显子c.1201C>T（p.Arg401Trp）。另1例未检出致病变异。结论:FSD是一种少见的遗传代谢性疾病，临床表现为肝功能异常伴低纤维蛋白原血症。肝脏活检组织学显示在脂肪变性、纤维化和炎性背景中，肝细胞胞质内可见周围透亮空晕的嗜酸性包涵体，抗纤维蛋白原免疫组织化学染色有助于诊断及鉴别诊断。电镜下具有指纹样结构进一步证实FSD。FGG测序检出第8号或第9号外显子致病性突变可明确解释其表型，但未检出相关变异不能排除FSD的诊断。“,”Objective:To investigate the clinicopathological and molecular characteristics of hepatic fibrinogen storage disease (FSD) in children.Methods:The clinical, histopathologic, immunophenotypic, ultrastructural and gene sequencing data of 4 FSD cases were collected from September 2019 to January 2021 in the Children′s Hospital of Fudan University, Shanghai, China. Retrospective analysis and literature review were conducted.Results:There were 4 cases of FSD, 3 males and 1 female, aged 3 years and 3 months to 6 years (median age, 3 years and 4 months). The clinical manifestations were abnormal liver function and abnormal blood coagulation function, for which 2 cases had family genetic history. Liver biopsies revealed that, besides liver steatosis, fibrosis and inflammation, there were single or multiple eosinophilic inclusion bodies of various sizes and surrounding transparent pale halo in hepatocytes. Immunohistochemistry showed that the inclusion bodies were positive for anti-fibrinogen. Under the electron microscope, they corresponded to the dilated cisternae of the rough endoplasmic reticulum, which were occupied by compactly packed tubular structures and arranged into a fingerprint-like pattern with curved bundles. Gene sequencing revealed that the 2 cases of FGG mutation were located in exon 8 c.1106A>G (p.His369Arg) and c.905T>C (p.Leu302Pro), and 1 case was located in exon 9 c.1201C>T (p.Arg401Trp). No pathogenic variant was detected in the other case.Conclusions:FSD is a rare genetic metabolic disease and clinically manifests as abnormal liver function with hypofibrinogenemia. In the background of liver steatosis, fibrosis and inflammation, there are eosinophilic inclusions with pale halo in the hepatocytic cytoplasm, which can be identified by anti-fibrinogen immunohistochemical staining. The fingerprint-like structures under electron microscope are helpful for the diagnosis, while FGG sequencing detects the pathogenic mutation of exon 8 or 9 that can clearly explain the phenotype. However, the diagnosis of FSD cannot be completely ruled out if the relevant mutations are not detected.