Metabolic autopsy with postmortem cultured fibroblasts in sudden unexpected death in infancy: Diagnosis of mitochondrial respiratory chain disorders

► There are few reports regarding the relationship between MRC disorders and SUDI. ► We performed metabolic autopsy in 13 Japanese cases of SUDI. ► We detected one case of MRC disorders with postmortem cultured fibroblasts. ► MRC disorders are one of the important inherited metabolic disorders causing SUDI. ► We advocate metabolic autopsy with postmortem cultured fibroblasts.